题目内容
表面粗糙度对零件结合的密封性没有影响。
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Ra比RZ更能反映表面粗糙度的实际情况。
Marshall Reed doesn’t enjoy eating fresh veggie omelets because he is tired of everyday cooking.
According to a new report, obesity is believed to be the direct cause of about 18% of deaths.
Experts worry that the increase of people’s weight may lead to a decline in life expectancies.
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