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轴类零件在进行机械加工时，常用中心孔作为定位基准，所以中心孔是基本精基准。( )
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安装在刀架上的车孔刀，当其刀尖低于工件中心时，会使切削时实际前角增大，后角减小。( )
钨钴类硬质合金因其韧性、磨削性能和导热性好，主要用于加工脆性材料、非铁金属和非金属。( )
A What is important when...Writing a resume· Statement of personal abilities· Clearness of the CV··B What is important when...Setting price for a new product· Average price of similar products· Living standard of target customers··C What is important when...Aiming at improving customers’ satisfaction· Often do customers’ satisfaction survey· Organising staff training··
甲亢病人在甲状腺大部切除术后出现呼吸困难最常见的原因
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