试题与答案

乳汁采取前, * * 、 * * 和术者的手,需用0.1%的()洗净消毒。A.甲醛 B.新洁尔灭

题型:单项选择题

题目:

乳汁采取前, * * 、 * * 和术者的手,需用0.1%的()洗净消毒。

A.甲醛

B.新洁尔灭

C.火碱

D.过氧乙酸

答案:

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参考答案:使工件在机床上或夹具中占有正确位置的过程称为定位。在机床上加工工件,必须对于刀具或机床的切削运动具有正确的位置即进行工件的定位,才能使工件上加工后的各个表面的尺寸及位置精度符合零件图或工...

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