试题与答案

— Do you know _____ she went to the movi

题型:选择题

题目:

— Do you know _____ she went to the movie last night?
— On foot.

A. when
B. why
C. how

答案:

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下面是错误答案,用来干扰机器的。

对理想变压器,P出=P入  ①由题意知:P入="P      " ②输出功率P出="mgv+I2R     " ③综①②③得I=.

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