机调员接到超劳预警信息后,应及时与()联系,提出解决意见。
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撤离时间(陆地),从乘务员获取撤离指令到滑梯充气时间最多为()。
A. 13秒钟
B. 13分钟
C. 15秒钟
D. 15分钟
In sewage treatment, the term maceration refers to the process of ()
A. breaking up solid matter into fine particles
B. precipitating non-decomposed waste in a collection tank
C. chemically adjusting the sewage ph to 7-0
D. eliminating bacterium coli from the sewage