题目内容

If you can't ________ a new copy, perhaps you can find a second-hand copy.

A) retire
B) afford
C) network
D) wave

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Most people didn’t ________ the harmful effect of smoking until they get lung cancer.

A) exist
B) compare
C) bite
D) realize

Tom held a big party to _________ his 24th birthday two days ago.

A) whisper
B) celebrate
C) value
D) pretend

在RLC串联电路中,UR=16V,UL=14V,UC=2V;则总电压为( )。

A. 28V
B. 20V
C. 32V
D. 0V

在正弦交流电路中,对任一节点,支路电流有效值之和为零。说法是否正确()。

A. 对
B. 错

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