A.电压的有效值为220V,电流的有效值为0.5A |
B.电压的最大值为220V,电流的有效值为0.5A |
C.电压的有效值为220V,电流的最大值为0.SA |
D.电压的最大值为220V,电流的最大值为0.5A |
2 |
2 |
U有 |
R |
220 |
440 |
2 |
2 |
A.10V,0.02s | B.10V,50Hz | ||||
C.10
| D.10
|
1 |
π |
A.7A | B.7
| C.
| D.10A |
A.250V | B.220V | C.0V | D.200V |
A. | B. | C. | D. |
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