造成往复压缩机排出温度高，但不会使压缩机过热的是（）。 缸头或水夹套积垢严重。 冷却器积垢严重。 气阀损坏。 缸套、活塞或活塞环过分磨损。
往复压缩机排气压力降低，与（）关闭不严无关。 气阀。 出口单流阀。 出口安全阀。 副线阀。
Which of the following precautions should always be carried out in dry dock?（） Liquids should never be transferred between tanks without consulting the dock master。 If sea valves have been disassembled, all bonnets must be checked for leakage when the ship is re-floated。 Before re-floating, all sea chest strainers should be verified as having been replaced。 All of the above。
As in the case of a voyage charter-party，it is implied in all bills of lading that（）will be made from the contractual route unless such deviation is justified. deviation。 no deviation。 navigation。 no navigatio。
设计一个测定水分运输速度的实验。
Which of the following statements about pump operations is NOT a correct statement?（）
