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【单选题】
一齿轮传动,已知主动齿轮齿数为20,转速为960r/min,从动齿轮齿数为60,则从动轮转速为( )。A.
320 r/min
B.
240 r/min
C.
360 r/min
D.
480 r/min
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举一反三
【简答题】烟酸缺乏时可引起 ,主要累及皮肤、消化系统、神经系统,其典型病例可有 、 和 。
【简答题】烟酸缺乏时可引起 ,主要累及皮肤、消化系统、神经系统,其典型病例可有 、 和痴呆,又称 “三 D ”症状。
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