问题
单项选择题
为了防止曲轴扭振过大，在曲轴的前端装有（）。
A.减振器
B.防振块
C.耐磨块
D.消声器
答案
参考答案：A
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为了防止曲轴扭振过大，在曲轴的前端装有（）。
A.减振器
B.防振块
C.耐磨块
D.消声器
参考答案：A
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A．brought about
B．turned out
C．made out
D．carried out