单项选择题The most suitable pump for oily water separator feed duties is ().

A.a reciprocating pump
B.a vane pump
C.a centrifugal pump
D.a triple screw pump


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1.单项选择题Placing a filter on the () of an oily water separator will "polish" the discharge but overloading must be avoided.

A.suction side
B.discharge side
C.by-pass pipe
D.sampling pipe

7.单项选择题In general, domestic flesh water tank kept under pressure by an external supply of ().

A.forced circulating pump
B.compressed air
C.gravity tank
D.bead tank

8.单项选择题The abbreviation "TDS" about the potable water probably means ().

A.total dissolved solids
B.temperature of distillation of sea water
C.total dissolved sodium
D.total delivery system

10.单项选择题In more recent years, () heat exchangers have frequently been employed for jacket water and oil cooling.

A.shell and tube type
B.plate type
C.coil type
D.conical disc type