单项选择题X 纠错
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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单项选择题
A.in entrance
B.in exit
C.in the upper part
D.on the outside
单项选择题
A.a reciprocating pump
B.a vane pump
C.a centrifugal pump
D.a triple screw pump
单项选择题
A.suction side
B.discharge side
C.by-pass pipe
D.sampling pipe
单项选择题
A.pressure
B.velocity
C.gravity
D.viscosity
单项选择题
A.the temperature
B.the viscosity
C.the gravity
D.the size
