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【简答题】
一台三相笼型异步异步电动机拖动某生产机械运行,当 f1=50HZ时,n0=3000r/min,求 当f1=40HZ,转差率为s=0.035时转子的转速。
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【简答题】The study of evolutionary change is vital to understanding how organisms change over time ______ (在生物适应性和遗传两个方面).
【单选题】British political scientists once had difficulty understanding how the unbalancing effects of affording greater representation to the wealthy was once the means of preserving the______of the commonwea...
A.
character
B.
equipoise
C.
affluence
D.
discontent
E.
rectitude
【简答题】How could you demonstrate your correct understanding of the register and the context? 如何说明你对语域及语境概念的正确理解?
【单选题】Social practice is _____ opportunity for students to gain _____ better understanding of how society operates.
A.
the; the
B.
the; a
C.
an; a
D.
an; the
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