题目内容
( )切削加工时,一定要有主运动和进给运动。
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( )四爪卡盘上的四个卡爪可同时移动,自动定心。
( )砂轮的强度、抗冲击性、耐热性及耐腐蚀性,主要取决于结合剂的种类和性质。
Directions： Complete the sentences with the correct form of the words below.finance, browse, keen, craft, cynical, \ elderly,increasingly, nuisance, pessimistic, realization,He was ##1## on travel literature.
He didn’t spend much so his personal ##2## were good.
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