你可能感興趣的試題

Increased internal leakage, in addition to poor hydraulic system response,and inadequate lubrication, is the result of （）.

A.pump bearings in poor condition
B.excessively worn actuator-piston packing
C.broken directional control valve centering springs
D.low hydraulic oil viscosity

單項(xiàng)選擇題

Most solenoid valves are actuated by （）.

A.a spring
B.an electromagnet
C.the force of gravity
D.refrigerant pressure

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The structural members of the hull extending in a fore and aft direction are called （）.

你可能感興趣的試題

Increased internal leakage, in addition to poor hydraulic system response,and inadequate lubrication, is the result of （）.

Most solenoid valves are actuated by （）.