低铬钝化槽液中,高锰酸钾应()加入一次。A、1~2个月 B、2~3个月 C、3~5个月

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问题:

低铬钝化槽液中,高锰酸钾应()加入一次。

A、1~2个月

B、2~3个月

C、3~5个月

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He got to the bus station early, _____ missing the first bus .

A.in case of

B.instead of

C.for fear of

D.in search of

题型:单项选择题

(B)

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下列哪项适用于产钳助产()

A.颏后位

B.胎头高浮

C.胎头明显变形、水肿

D.臀位,后出头困难

E.头位死胎,宫口开全,S+3

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抑制性突触后电位的产生是由于突触后膜提高了对()

A.Cl-的通透性

B.K+的通透性

C.Na+的通透性

D.Mg2+的通透性

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安检验讫章不得带离工作现场,遇有特殊情况需带离时,必须经安检部门值班领导批准。

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