Demulsibility of a lube oil is defined as ().
A. the ability of oil to separate from water
B. the temperature at which oil flows rapidly
C. a measure of the water in a lube oil system
D. an emulsion of different grades of oil
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卧具未按规定时间取送,属于()问题。
A. 红线
B. A1
C. A2
D. B
以下可以作为白天能见度目标物的是()。
A. 远处的小山
B. 古塔
C. 拉索大桥灰色立柱
D. 烟囱
客货共线铁路,速度大于160km/h,小于200km/h的区间双线线间最小距离规定为多少?