问题
单项选择题
三相四线制供电的相电压为200V，与线电压最接近的值为（）V。
A、250
B、280
C、346
D、380
答案
参考答案：C
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三相四线制供电的相电压为200V，与线电压最接近的值为（）V。
A、250
B、280
C、346
D、380
参考答案：C
| 从方框中选择恰当的选项补全对话。 | |
Jim: Hello! This is Jim. 1_______ Jane: Speaking. Jim: Hi, Jane! How are you? Jane: Fine, thanks. And you? Jim: I'm fine, too. 2_______ Jane: 3_______ Jim: Would you like to go fishing with me? Jane: 4_______ But I have something to do this afternoon. Jim: How about tomorrow afternoon? Jane: OK. 5_______ Jim: Goodbye. Jane: Bye. |