A.the engine stopped
B.the engine was stopped
C.he stopped the engine
D.he had stopped the engine
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A.To satisfy
B.To be satisfied
C.After satisfying
D.After being satisfied
A.forces
B.enables
C.makes
D.is able to
A.makes the experts to judge
B.enables the experts to judge
C.make the experts judging
D.enable the experts to judge
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
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