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【单选题】
对称三相电路三角形连接时,线电流比对应的相电流( )。A.
滞后30°
B.
滞后120°
C.
超前30°
D.
同相位
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举一反三
【单选题】We just naturally think that the future will --------- the past .
A.
assemble
B.
vanish
C.
resemble
D.
contact
【单选题】Any lesson we teach naturally divide into different stages of activity and the main stages are: presentation, practice, production, reading, listening and ____.
A.
speaking
B.
writing
C.
comprehension
D.
revision
【简答题】One of the most difficult questions to answer is how much a job is worth. We naturally expect that a doctor’s salary will be higher than a bus conductor’s wage. But the question becomes much more diff...
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