单项选择题
In （）the control action is independent on the output.
A.a closed loop control system
B.an open loop control system
C.a boiler control system
D.a steering gear
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单项选择题
The （）is fitted on an oily water separator.
A.sliding bowl bottom
B.gravity disc
C.bowl
D.liquid level detector -
单项选择题
The （）is not a component of an oil separator.
A.sliding bowl bottom
B.gravity disc
C.separating disc
D.scum valve -
单项选择题
The （）pump is usually used as the lubricating oil pump.
A.turbine
B.screw
C.vaneejector
D.centrifugal
