离心泵试车前要检查填料密封是否有压得过紧过松现象。

填料密封老化，自润滑性差，轴和填料（），易造成填料密封温度偏高。

Every deliberate act of wrongdoing by the master or any of the crew against the ship or cargo，without the authorization or privity of the Shipowner or his agent，is（）.

（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.

A salvor may be（）the whole or part of the payment due under Salvage Convention to the extent that the salvage operations have become necessary or more difficult because of fault or neglect on his part or if the salvor has been guilty of fraud or other dishonest conduct.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

以下哪些情况会造成提示“Incorrect number or IP address”？（）

采用填料密封的机泵填料压得越紧越好。

（）会造成填料函漏水过多

冷凝工段泵工岗位有哪些技术规定？

矿井泵工每班都巡回检查，检查时间为（）小时/次。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。