题目内容

电机缺相运行时,电动机转数()。

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动物体液(包括细胞内液)约占体重的()

A. 10%-20%
B. 40%-50%
C. 60%-70%

较大火灾事故的消防技术调查报告应逐级上报至()。

A. 公安部
B. 公安部消防局
C. 省级公安机关
D. 省级公安机关消防机构

A vessel would be referred to as tender when the weight of the cargo is().

A. evenly distributed vertically and the double bottoms are full
B. concentrated low and the double bottoms are empty
C. concentrated low and the double bottoms are full
D. concentrated high and the double bottoms are empty

长管式防毒面具使用前怎样确定是否好用?

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