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【单选题】
三相异步电动机 低速下放重物时, 定子绕组 接入的是 与提升重物时同 的 三相交流电源, 只是在转子回路串入了大电阻, 电动机运行在( )状态。A.
正转电动
B.
反向回馈制动
C.
正向回馈制动
D.
倒拉反接制动
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反馈参考答案：
举一反三
【单选题】标志着毛泽东思想的初步形成是（ ）
A.
新民主主义政治、经济和文化纲领的提出
B.
农村包围城市，武装夺取政权革命道路理论的提出
C.
新民主主义革命理论科学体系的形成
D.
实事求是思想路线的提出
【单选题】He was told that it would be at least three more months _____ he could recover and return to work.
A.
when
B.
since
C.
before
D.
that
【单选题】. He was told that it would be at least three more months __________ he could recover and return to work.
A.
when
B.
before
C.
since
D.
that
【单选题】He was told that it would be at least three more months ___________ he could receover and return to work.
A.
when
B.
before
C.
since
D.
that
【简答题】He was told that it would be at least three more months __________ he could recover and return to work. A．when B．before C．since D．that
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