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【单选题】
一对圆柱齿轮传动，通常把小齿轮的齿宽取值比大齿轮略大，其主要目的是（）A.
使小齿轮的强度比大齿轮略高一些
B.
减小传动中的动载荷
C.
为了便于安装，保证有效接触宽度
D.
避免沿齿向载荷分布不均匀
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