单项选择题

When there is no movement of the rams on an electro-hydraulic steering gear, the tilting box of the running pump is （）.

A.set for maximum torque
B.on the purge and vent stroke
C.in the neutral position
D.rotating backwards

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单项选择题

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

A.frames
B.joiners
C.longitudinals
D.knees

单项选择题

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

单项选择题

Most solenoid valves are actuated by （）.

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