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减少传动链传动误差的措施常有哪些？

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？？？？It has been almost five years we saw each other last time.？？？？

A. after
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常用的四种保证装配精度的方法是完全互换装配法、选择装配法、()装配法和()装配法。

Jack is news reporter and he likes job very much.

A. a；the
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