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进行水泥标准稠度用水量测定时,净浆拌合完毕后进行沉入深度的测量应在()内完成。
A. 1.5min
B. 2min
C. 2.5min
D. 3min
只有大国才能进行国家干预价格,小国政府往往起不到这样的效果。
A. 正确
B. 错误
如果一个LED指示灯没有定义颜色,红、绿、黄、橙、蓝、白色你会选择哪一种,为什么?
One of the reasons that causes oil flowed from sludge outlet of a self-cleaning purifier is ()
A. seal water supply be cut off
B. make-up water supply be cut off
C. oil outlet valve closed or not open sufficiently
D. the flow rate of oil is too much