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
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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
为了改善断路器各断口的均压性能,要在每个断口上()
A. 并联电阻
B. 并联电感
C. 并联电容
D. 串联电阻