搜尋
產品
社群
市場
經紀商
更多
TW
立即開始
市場
/
德國
/
股票
/
通訊
/
無線通訊
/
BAC
/
債券
Verizon Communications Inc.
BAC
Stuttgart Stock Exchange
BAC
Stuttgart Stock Exchange
BAC
Stuttgart Stock Exchange
BAC
Stuttgart Stock Exchange
休市
沒有交易
概要
財務數據
新聞
社群
技術分析
預測
季節性
債券
ETF
更多
公司債券
以下是按到期殖利率排序的Verizon Communications Inc.債券清單。在市場波動時,投資者通常會選擇公司的債券以獲取更高的穩定性。研究價格、殖利率及其他數據,尋找可靠的投資商品。
商品
YTM %
成交量
價格 %
票息 %
到期日
未償金額
面值
最小面額金額
發行人
V
VZ.HQ
Chesapeake & Potomac Telephone Co. of West Virginia 8.4% 15-OCT-2029
7.76%
3 K
102.00%
8.400%
2029-10-15
23.28 M
USD
1,000.00
USD
1,000.00
USD
Chesapeake & Potomac Telephone Co. of West Virginia
F
FYBR5412283
Frontier Communications Holdings, LLC 8.75% 15-MAY-2030
7.64%
300 K
104.00%
8.750%
2030-05-15
1.2 B
USD
1,000.00
USD
2,000.00
USD
Frontier Communications Holdings LLC
F
FYBR5549993
Frontier Communications Holdings, LLC 8.625% 15-MAR-2031
7.46%
100 K
105.00%
8.625%
2031-03-15
750 M
USD
1,000.00
USD
2,000.00
USD
Frontier Communications Holdings LLC
V
VICX5890658
Victra Holdings, LLC 8.75% 15-SEP-2029
6.76%
500 K
106.50%
8.750%
2029-09-15
450 M
USD
1,000.00
USD
2,000.00
USD
Victra Holdings LLC
AU3CB027888
Verizon Communications Inc. 3.85% 23-MAR-2041
6.60%
0
73.87%
3.850%
2041-03-23
150 M
AUD
10,000.00
AUD
200,000.00
AUD
Verizon Communications, Inc.
F
FYBR5083318
Frontier Communications Corporation 6.75% 01-MAY-2029
6.55%
8 K
100.63%
6.750%
2029-05-01
1 B
USD
1,000.00
USD
2,000.00
USD
Frontier Communications Corp.
AU3CB026816
Verizon Communications Inc. 3.5% 04-NOV-2039
6.53%
0
72.76%
3.500%
2039-11-04
500 M
AUD
10,000.00
AUD
200,000.00
AUD
Verizon Communications, Inc.
VZ5680218
Verizon Communications Inc. 6.4% 15-NOV-2053
6.40%
80 K
100.00%
6.400%
2053-11-15
2.55 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4702900
Verizon Communications Inc. 4.7% 15-SEP-2048
6.36%
4 K
80.17%
4.700%
2048-09-15
2.46 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ5700832
Verizon Communications Inc. 6.1% 15-NOV-2053
6.28%
18 K
97.50%
6.100%
2053-11-15
419 K
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ5652669
Verizon Communications Inc. 5.8% 15-SEP-2053
6.20%
30 K
94.62%
5.800%
2053-09-15
549 K
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ5773713
Verizon Communications Inc. 5.3% 15-MAR-2054
6.16%
300 K
88.50%
5.300%
2054-03-15
643 K
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ5718895
Verizon Communications Inc. 5.4% 15-DEC-2053
6.13%
12 K
90.26%
5.400%
2053-12-15
764 K
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ5711883
Verizon Communications Inc. 5.75% 15-DEC-2053
6.13%
10 K
94.94%
5.750%
2053-12-15
740 K
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ5705330
Verizon Communications Inc. 6.05% 15-NOV-2053
6.12%
15 K
99.00%
6.050%
2053-11-15
1.11 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
US92343VCM4
Verizon Communications Inc. 5.012% 21-AUG-2054
6.11%
0
85.18%
5.012%
2054-08-21
793.98 M
USD
1,000.00
USD
2,000.00
USD
Verizon Communications, Inc.
BACU
Verizon Communications Inc. 5.012% 15-APR-2049
6.10%
0
86.50%
5.012%
2049-04-15
696.68 M
USD
1,000.00
USD
2,000.00
USD
Verizon Communications, Inc.
VZ6231140
Verizon Communications Inc. 6.0% 30-NOV-2065
6.09%
5.18 M
98.87%
6.000%
2065-11-30
2 B
USD
1,000.00
USD
2,000.00
USD
Verizon Communications, Inc.
VZ5633193
Verizon Communications Inc. 5.8% 15-AUG-2053
6.08%
34 K
96.21%
5.800%
2053-08-15
753 K
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4727759
Verizon Communications Inc. 4.75% 15-OCT-2048
6.05%
9 K
84.05%
4.750%
2048-10-15
2.77 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ5414108
Verizon Communications Inc. 4.8% 15-MAY-2052
6.03%
5 K
83.81%
4.800%
2052-05-15
515 K
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ.RX
Verizon Communications Inc. 8.95% 01-MAR-2039
6.03%
4 K
127.51%
8.950%
2039-03-01
107.16 M
USD
1,000.00
USD
2,000.00
USD
Verizon Communications, Inc.
VZ4611262
Verizon Communications Inc. 4.75% 15-MAR-2048
6.02%
6 K
84.50%
4.750%
2048-03-15
7.79 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ5700819
Verizon Communications Inc. 3.0% 29-SEP-2060
6.01%
609 K
56.09%
3.000%
2060-09-29
1.12 B
USD
1,000.00
USD
100,000.00
USD
Verizon Communications, Inc.
VZ4632281
Verizon Communications Inc. 4.9% 15-MAY-2048
6.00%
10 K
86.24%
4.900%
2048-05-15
9.69 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4649209
Verizon Communications Inc. 4.9% 15-JUN-2048
6.00%
2 K
86.50%
4.900%
2048-06-15
11.01 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ5892125
Verizon Communications Inc. 5.15% 15-SEP-2054
6.00%
80 K
88.40%
5.150%
2054-09-15
3.13 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4609142
Verizon Communications Inc. 4.75% 15-MAR-2048
5.99%
10 K
87.57%
4.750%
2048-03-15
7.5 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4809148
Verizon Communications Inc. 4.5% 15-MAR-2049
5.98%
20 K
81.48%
4.500%
2049-03-15
3.56 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ6231139
Verizon Communications Inc. 5.875% 30-NOV-2055
5.98%
22.44 M
98.55%
5.875%
2055-11-30
3.25 B
USD
1,000.00
USD
2,000.00
USD
Verizon Communications, Inc.
VZ4766681
Verizon Communications Inc. 5.0% 15-NOV-2048
5.96%
15 K
88.05%
5.000%
2048-11-15
6.1 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4807252
Verizon Communications Inc. 4.55% 15-MAR-2049
5.96%
200 K
82.39%
4.550%
2049-03-15
1.56 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4503469
Verizon Communications Inc. 4.75% 15-JUN-2047
5.96%
30 K
85.45%
4.750%
2047-06-15
31.28 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4508287
Verizon Communications Inc. 4.7% 15-JUN-2047
5.96%
105 K
84.71%
4.700%
2047-06-15
32.91 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4593454
Verizon Communications Inc. 4.55% 15-FEB-2048
5.96%
36 K
82.85%
4.550%
2048-02-15
15.07 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4575331
Verizon Communications Inc. 4.5% 15-DEC-2047
5.95%
44 K
82.33%
4.500%
2047-12-15
15.54 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4559111
Verizon Communications Inc. 4.7% 15-NOV-2047
5.95%
30 K
84.82%
4.700%
2047-11-15
44.21 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4629839
Verizon Communications Inc. 4.85% 15-MAY-2048
5.95%
20 K
86.53%
4.850%
2048-05-15
7.21 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4539988
Verizon Communications Inc. 4.75% 15-SEP-2047
5.94%
45 K
85.53%
4.750%
2047-09-15
17.1 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4514567
Verizon Communications Inc. 4.55% 15-JUL-2047
5.94%
36 K
83.23%
4.550%
2047-07-15
16.92 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ5148414
Verizon Communications Inc. 3.7% 22-MAR-2061
5.94%
134 K
67.45%
3.700%
2061-03-22
2.85 B
USD
1,000.00
USD
2,000.00
USD
Verizon Communications, Inc.
VZ4613097
Verizon Communications Inc. 4.8% 15-MAR-2048
5.94%
9 K
86.07%
4.800%
2048-03-15
8.66 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ5641250
Verizon Communications Inc. 5.9% 15-AUG-2053
5.93%
115 K
99.55%
5.900%
2053-08-15
476 K
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4542142
Verizon Communications Inc. 4.75% 15-SEP-2047
5.92%
20 K
85.78%
4.750%
2047-09-15
16.78 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4774265
Verizon Communications Inc. 5.0% 15-DEC-2048
5.92%
30 K
88.50%
5.000%
2048-12-15
6.59 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4572378
Verizon Communications Inc. 4.55% 15-DEC-2047
5.92%
102 K
83.29%
4.550%
2047-12-15
19.02 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ.SV
Verizon Communications Inc. 6.0% 01-APR-2041
5.92%
10 K
100.80%
6.000%
2041-04-01
122.14 M
USD
1,000.00
USD
2,000.00
USD
Verizon Communications, Inc.
VZ5205720
Verizon Communications Inc. 2.2% 15-JUN-2031
5.91%
5 K
83.13%
2.200%
2031-06-15
3.04 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4213475
Verizon Communications Inc. 4.672% 15-MAR-2055
5.91%
37 K
82.80%
4.672%
2055-03-15
722.56 M
USD
1,000.00
USD
2,000.00
USD
Verizon Communications, Inc.
VZ4577393
Verizon Communications Inc. 4.5% 15-DEC-2047
5.91%
140 K
82.74%
4.500%
2047-12-15
27.18 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4665741
Verizon Communications Inc. 4.65% 15-AUG-2048
5.91%
15 K
84.41%
4.650%
2048-08-15
3.05 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ5680217
Verizon Communications Inc. 5.9% 15-NOV-2030
5.90%
52 K
100.00%
5.900%
2030-11-15
1.82 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ5656550
Verizon Communications Inc. 5.9% 15-SEP-2053
5.90%
90 K
99.99%
5.900%
2053-09-15
630 K
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4663140
Verizon Communications Inc. 4.7% 15-AUG-2048
5.89%
15 K
85.14%
4.700%
2048-08-15
2.62 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4693571
Verizon Communications Inc. 4.7% 15-SEP-2048
5.89%
30 K
85.16%
4.700%
2048-09-15
3.08 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ5715898
Verizon Communications Inc. 5.45% 15-DEC-2053
5.89%
25 K
93.94%
5.450%
2053-12-15
586 K
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ5898346
Verizon Communications Inc. 5.1% 15-SEP-2054
5.89%
50 K
89.10%
5.100%
2054-09-15
3.28 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4804605
Verizon Communications Inc. 4.5% 15-MAR-2049
5.89%
40 K
82.56%
4.500%
2049-03-15
3.17 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4686290
Verizon Communications Inc. 4.85% 15-SEP-2048
5.88%
20 K
87.10%
4.850%
2048-09-15
4.59 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4779888
Verizon Communications Inc. 4.9% 15-DEC-2048
5.87%
50 K
87.84%
4.900%
2048-12-15
1.64 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
US92343VCK8
Verizon Communications Inc. 4.862% 21-AUG-2046
5.87%
0
88.08%
4.862%
2046-08-21
2.36 B
USD
1,000.00
USD
2,000.00
USD
Verizon Communications, Inc.
US92343VFV1
Verizon Communications Inc. 3.0% 20-NOV-2060
5.87%
0
57.62%
3.000%
2060-11-20
1.89 B
USD
1,000.00
USD
2,000.00
USD
Verizon Communications, Inc.
VZ4636949
Verizon Communications Inc. 5.0% 15-JUN-2048
5.86%
215 K
89.28%
5.000%
2048-06-15
51.59 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
BACL
Verizon Communications Inc. 4.125% 15-AUG-2046
5.86%
0
79.41%
4.125%
2046-08-15
868.29 M
USD
1,000.00
USD
2,000.00
USD
Verizon Communications, Inc.
BACP
Verizon Communications Inc. 5.5% 16-MAR-2047
5.86%
0
95.66%
5.500%
2047-03-16
457.34 M
USD
1,000.00
USD
2,000.00
USD
Verizon Communications, Inc.
US92343VCX0
Verizon Communications Inc. 4.522% 15-SEP-2048
5.86%
0
83.35%
4.522%
2048-09-15
1.25 B
USD
1,000.00
USD
2,000.00
USD
Verizon Communications, Inc.
VZ4530419
Verizon Communications Inc. 4.8% 15-AUG-2047
5.85%
40 K
87.16%
4.800%
2047-08-15
22.76 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4968008
Verizon Communications Inc. 4.0% 22-MAR-2050
5.85%
6.33 M
75.92%
4.000%
2050-03-22
1.14 B
USD
1,000.00
USD
2,000.00
USD
Verizon Communications, Inc.
VZ5181143
Verizon Communications Inc. 2.987% 30-OCT-2056
5.85%
7.07 M
59.31%
2.987%
2056-10-30
3.65 B
USD
1,000.00
USD
2,000.00
USD
Verizon Communications, Inc.
VZ4661925
Verizon Communications Inc. 4.8% 15-AUG-2048
5.85%
50 K
85.59%
4.800%
2048-08-15
5.76 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4627701
Verizon Communications Inc. 4.85% 15-MAY-2048
5.85%
26 K
85.85%
4.850%
2048-05-15
4.53 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4769162
Verizon Communications Inc. 4.9% 15-NOV-2048
5.85%
75 K
88.11%
4.900%
2048-11-15
1.3 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ5427865
Verizon Communications Inc. 3.85% 15-JUN-2029
5.84%
54 K
90.50%
3.850%
2029-06-15
152 K
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ5464679
Verizon Communications Inc. 4.65% 15-AUG-2052
5.84%
153 K
83.88%
4.650%
2052-08-15
351 K
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
BAC7
Verizon Communications Inc. 2.875% 20-NOV-2050
5.84%
0
61.40%
2.875%
2050-11-20
2.08 B
USD
1,000.00
USD
2,000.00
USD
Verizon Communications, Inc.
VZ4651554
Verizon Communications Inc. 5.05% 15-JUL-2048
5.83%
107 K
90.28%
5.050%
2048-07-15
37.63 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
US92343VAK0
Verizon Communications Inc. 6.4% 15-FEB-2038
5.83%
0
104.90%
6.400%
2038-02-15
172.07 M
USD
1,000.00
USD
2,000.00
USD
Verizon Communications, Inc.
VZ5363445
Verizon Communications Inc. 3.875% 01-MAR-2052
5.83%
158 K
73.97%
3.875%
2052-03-01
1 B
USD
1,000.00
USD
2,000.00
USD
Verizon Communications, Inc.
VZ6231141
Verizon Communications Inc. 5.75% 30-NOV-2045
5.82%
3.27 M
99.34%
5.750%
2045-11-30
1.5 B
USD
1,000.00
USD
2,000.00
USD
Verizon Communications, Inc.
VZ5757377
Verizon Communications Inc. 5.5% 23-FEB-2054
5.82%
1.5 M
95.85%
5.500%
2054-02-23
1 B
USD
1,000.00
USD
2,000.00
USD
Verizon Communications, Inc.
VZ4531200
Verizon Communications Inc. 5.15% 15-SEP-2050
5.81%
1.5 M
91.30%
5.150%
2050-09-15
950 M
USD
1,000.00
USD
100,000.00
USD
Verizon Communications, Inc.
VZ4634715
Verizon Communications Inc. 4.85% 15-MAY-2048
5.81%
12 K
88.09%
4.850%
2048-05-15
4.69 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ5637427
Verizon Communications Inc. 5.8% 15-AUG-2053
5.81%
10 K
99.88%
5.800%
2053-08-15
1.21 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4670535
Verizon Communications Inc. 4.65% 15-AUG-2048
5.79%
14 K
85.68%
4.650%
2048-08-15
2.81 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
US92343VGB4
Verizon Communications Inc. 3.55% 22-MAR-2051
5.79%
0
70.47%
3.550%
2051-03-22
3.59 B
USD
1,000.00
USD
2,000.00
USD
Verizon Communications, Inc.
VZ5390589
Verizon Communications Inc. 4.0% 15-APR-2052
5.79%
20 K
75.88%
4.000%
2052-04-15
948 K
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4564307
Verizon Communications Inc. 4.65% 15-NOV-2047
5.78%
10 K
86.04%
4.650%
2047-11-15
16.76 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4567039
Verizon Communications Inc. 4.65% 15-NOV-2047
5.78%
13 K
86.06%
4.650%
2047-11-15
22.36 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4498542
Verizon Communications Inc. 4.9% 15-MAY-2047
5.77%
214 K
86.22%
4.900%
2047-05-15
207.02 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
XS225133760
Verizon Communications Inc. 1.875% 03-NOV-2038
5.77%
0
65.48%
1.875%
2038-11-03
600 M
GBP
1,000.00
GBP
100,000.00
GBP
Verizon Communications, Inc.
VZ4645544
Verizon Communications Inc. 4.95% 15-JUN-2048
5.77%
5 K
89.76%
4.950%
2048-06-15
9.71 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
BACA
Verizon Communications Inc. 6.55% 15-SEP-2043
5.77%
0
108.55%
6.550%
2043-09-15
803.36 M
USD
1,000.00
USD
2,000.00
USD
Verizon Communications, Inc.
VZ4544355
Verizon Communications Inc. 4.7% 15-SEP-2047
5.76%
12 K
86.95%
4.700%
2047-09-15
32.92 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4600553
Verizon Communications Inc. 4.75% 15-FEB-2048
5.75%
34 K
87.52%
4.750%
2048-02-15
13.62 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4606939
Verizon Communications Inc. 4.75% 15-MAR-2048
5.75%
50 K
87.50%
4.750%
2048-03-15
9.56 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4532729
Verizon Communications Inc. 4.9% 15-AUG-2047
5.75%
150 K
89.55%
4.900%
2047-08-15
38.83 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4535073
Verizon Communications Inc. 4.85% 15-AUG-2047
5.74%
100 K
86.10%
4.850%
2047-08-15
28.26 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
US92343VBG8
Verizon Communications Inc. 3.85% 01-NOV-2042
5.74%
0
79.78%
3.850%
2042-11-01
633.57 M
USD
1,000.00
USD
2,000.00
USD
Verizon Communications, Inc.
VZ4597707
Verizon Communications Inc. 4.55% 15-FEB-2048
5.74%
10 K
85.17%
4.550%
2048-02-15
4.84 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
VZ4764943
Verizon Communications Inc. 5.0% 15-NOV-2048
5.72%
200 K
90.80%
5.000%
2048-11-15
8.49 M
USD
1,000.00
USD
1,000.00
USD
Verizon Communications, Inc.
載入更多
在篩選器中創建更多清單