Which of the listed cylinder liner surface conditions indicates proper lubrication?()
A. Dull black appearance
Bright appearance
C. Thin layer of lacquer
D. Thick oily film
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Accidental escape of oil out of a tank when it gets too full because pumping was not stopped in time defines().
A. overloading
B. over discharging
C. overflow
D. overtaking
水滴平均粒径大于0.1mm,用来降低热幅射的伞形水射流是()水流。
A. 开花
B. 雾状
C. 充实
D. 无法界定
交流电力牵引区段,相邻吸上线的安装间距不得小于()闭塞分区。
A. 1个
B. 2个
C. 3个
D. 4个