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
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