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
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