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【单选题】
当Zk>Zg1时,UP与UP关系为（ ）。A.
相位差90°
B.
相位差180°
C.
U'P与UP同相位
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【简答题】阅读下面短文，根据短文内容用方框内所给词语的适当形式填空，使短文语义完整。 sell another and money be shout for if work thirst A tourist was traveling alone in the desert (沙漠). After two weeks his car stopped 1. ,...
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