问题
单项选择题
三相半控桥式整流电路每只晶闸管承受的最大反向电压为（）。
A、0．9U
B、1．414U2
C、2U2
D、2．45U222
答案
参考答案：D
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三相半控桥式整流电路每只晶闸管承受的最大反向电压为（）。
A、0．9U
B、1．414U2
C、2U2
D、2．45U222
参考答案：D
| 补全对话。（根据对话情景，选择适当的选项填入对话的空白处。） | |
| A: 1__________ B: It is not big but beautiful. A: How many students are there in your class? B. 2_________ What about yours? A: Fifty students. 3_________ B: No, we have ten subjects. A: Then how many hours do you spend on homework every day? B: 4_______ A: That's a little longer. We only need two hours. 5_________ And we have to write reports about the books we read. | |
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