A.Variable volumes can be obtained with gear pumps only by variation of the pump drive speed
B.A radial piston pump houses sliding pistons in a stationary cylinder block through which passes a rotating pintle or ported shaft
C.The amount of fluid displaced per revolution of an axial piston rotary pump is dependent on the angle formed between the cylinder block and valve plate
D.All of the above
第1题
A.1% to 3%
B.1% to 2%
C.4%
D.2% to 4%
第2题
A.stress
B.strain
C.shear strength
D.ultimate tensile strength
第3题
A.hydrogen chloride
B.calcium chloride
C.sulfuric acid
D.muriatic acid
第4题
A.A piston
B.A fuel injection pump
C.A feed water pump
D.A lube oil pump
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