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 long as the vessel is capable of performing the service immediately required，hire will （）. cease to be payable。 begin to be withdrawn。 continue to be payable。 be returned。
设计一个测定水分运输速度的实验。
设计一个证明植物具有蒸腾作用的实验装置。
保护现场的原始状态，包括（）不随意挪动位置。
