题目内容

A: Yes. The time, please?B: Well, a _________ to Hong Kong on Tuesday, the 14th.

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A: I'm sorry, but there's no direct flight ________ on Tuesday.B: What about Wednesday?

A: What's your _________ for tomorrow?B: Tomorrow is Tuesday. I'm attending the sales meeting at 9:00 in the morning.

A: When are you_________ back?B: I'll take the 2:15 flight back on Sunday afternoon.

单选题1. 三相四线电能计量装置错误接线分析时,如果U12滞后于U32的角度为300°,则电压相序为( )。

A. 正相序
B. 逆相序
C. 零相序