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【简答题】
剪切变形的特点。
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反馈参考答案：
举一反三
【简答题】三相半波可控整流电路中, 带阻感负载时, a 的移相范围为()。
【单选题】—Why，I didn’t get you on the phone. —We ________football on the playground when you phoned.
A.
must be playing
B.
must play
C.
must have played
D.
must have been playing
【单选题】–Why, I couldn’t get you on the phone this morning. --We _____ tennis in the yard when you called.
A.
must be playing
B.
could be playing
C.
must have played
D.
must have been playing
【简答题】运输企业的民事责任是指运输企业违反法定义务和合同义务所应承担的法律责任,它可以分为违约责任和( )。
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