修磨薄板群钻主要是将两主切削刃磨成圆弧形,钻尖膳低,直到形成() ["三尖","分屑槽","两顶角","外刃"]
第2类危险物品为() ["A、腐蚀性物质","B、放射性物质","C、爆炸品","D、气体"]
多收邮件路单的英文简称为() ["A、FDCA","B、FDAV","C、FDMB","D、FDAW"]
目霍,麻花钻(),可以判断出麻花钻后角的大小。 ["横刃斜角","项角","前角","钻心角"]
当麻花钻顶角小于118‘时,两主切削刃呈()。 ["直线形","曲线形","外凸形","内凹形"]
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