A.makes the experts to judge
B.enables the experts to judge
C.make the experts judging
D.enable the experts to judge
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A.in entrance
B.in exit
C.in the upper part
D.on the outside
A.a reciprocating pump
B.a vane pump
C.a centrifugal pump
D.a triple screw pump
A.suction side
B.discharge side
C.by-pass pipe
D.sampling pipe
A.pressure
B.velocity
C.gravity
D.viscosity
A.the temperature
B.the viscosity
C.the gravity
D.the size
A.water level
B.water flow
C.temperature
D.pressure
A.flat
B.slat
C.sweet
D.acid
A.starters
B.pressure switches
C.pressure
D.water
A.forced circulating pump
B.compressed air
C.gravity tank
D.bead tank
A.total dissolved solids
B.temperature of distillation of sea water
C.total dissolved sodium
D.total delivery system
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（） is not installed on the main switchboar.
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