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【简答题】
在三相四线制电源中，线电压有效值等于相电压的 倍，线电压比相应的相电压相位 。
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反馈参考答案：
举一反三
【单选题】The teacher assigned the task to the three boys and ________ did his share.
A.
any
B.
all
C.
every
D.
each
【单选题】The two boys________each other in appearance but differ widely in their tastes.
A.
are resembling
B.
resemble
C.
are resembled
D.
resembled
【单选题】The mother was about to call her friend when the three boys started argue with each other about something in the backyard.
A.
Right
B.
Wrong
C.
Not mentioned
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