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【单选题】
若非正弦周期电流i分解为各种不同频率成分，【图片】，则下列各式中正确的是（ ）。A.
最大值相量
B.
有效值
C.
平均功率
D.
平均功率
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【单选题】听力原文：M: I don't think it is a good idea to spend more time chatting online. I mean it is really a waste of time. W: Well, but I think sometimes chatting online can help you to reduce your stress and m...
A.
It's a waste of time.
B.
It makes her restless.
C.
It helps relieve stress.
D.
It's a way to make friends.
【单选题】兰州黄土,天然含水率为5.5%,密度为1.296克每立方厘米,土粒比重为2.68。当压力从0增加到100千帕时,百分表从9.510变化到9.206。此时压缩系数a0-1最接近()MPa-1。
A.
0.017
B.
0.17
C.
0.034
D.
0.34
【简答题】阅读短文，从下列所给的五个句子中，选择四句还原到短文中，使短文意思通顺、结构 完整。 Flena Desserich was a beautiful girl. 1 She had dreamed of becoming an artist when she grew up, but sadly ,she never had the chance to he an . WhenElena...
【单选题】I don't think it impressive,___________ , I think it badly made. [ ]
A.
after all
B.
as a matter of fact
C.
instead of
D.
furthermore
【简答题】短文填空 先通读下面的短文，然后根据短文内容和所给首字母，在空格内填入一个适当的词，使短文意思完整。所填单词必须在答题卡标有题号的横线上完整写出。（本大题共6分，每格0.5分） Who was Leonardo da Vinci? You may answer without t 小题1: : “He is the painter of the Mona Lisa.” What e 小题2: do...
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