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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A.sliding bowl bottom
B.gravity disc
C.bowl
D.liquid level detector
A.sliding bowl bottom
B.gravity disc
C.separating disc
D.scum valve
A.turbine
B.screw
C.vaneejector
D.centrifugal
A.leaky pipe
B.opened inlet valve
C.too much water in tank
D.None of the above
A.Steam trap
B.Check valve
C.Separator
D.Strainer
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（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.