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【单选题】
以下哪些是同步器的作用( ) a.使接合套与待接合齿圈两者之间能迅速同步 b.阻止在同步之前轮齿进行啮合 c.阻止接合套与待接合齿圈啮合 d.防止产生结合齿圈之间的冲击
A.
abd
B.
abc
C.
cbd
D.
acd
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