海船船员 2021_05_20 每日一练
筒状活塞式柴油机活塞运动部件平台检验相对位置的技术要求是()。
A、活塞裙外圆与活塞杆外圆同轴度符合要求
B、活塞中心线与活塞销中心线垂直、相交
C、连杆与活塞装配后连杆大、小端轴承孔中心线平行
D、装配后活塞中心线与连杆大端轴承孔中心线垂直、相交
Before doing any work on a hydraulic system equipped with accumulators, you should
A.drain the accumulators and purge with oxygen
B.bleed off all stored energy from the accumulators completely
C.charge the accumulators to prevent system energy loss
D.pump the hydraulic fluid into the accumulators to prevent fluid loss