[填空题]保证装配精度的方法有四种，调节装配法是用一个可调节尺寸的零件，来补偿装配积累误差。补偿原理有两种，一是调节补偿件在机器中的位置，二是增加一个一定尺寸的（ ），用改变这个零件的尺寸进行调节。

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