单项选择题
A.set for maximum torque B.on the purge and vent stroke C.in the neutral position D.rotating backwards
The structural members of the hull extending in a fore ...
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
Increased internal leakage, in addition to poor hydraul...
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
Most solenoid valves are actuated by （）.A.a springB.an ...
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
