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【单选题】
带传动的主动轮直径 d d1 = 180mm 、转速 n 1 =940r/min ,从动轮直径 d d2 = 710mm ,若滑动率为 1% ,则从动轮转速 n 2 是 ___________r/min 。A.
236
B.
238
C.
240
D.
242
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A.
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C.
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D.
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A.
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B.
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C.
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