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
单项选择题 The structural members of the hull extending in a fore and aft direction are called （）.
单项选择题 Increased internal leakage, in addition to poor hydraulic system response,and inadequate lubrication, is the result of （）.
单项选择题 Most solenoid valves are actuated by （）.
