Q235、Q345都是普通碳素结构钢。

钢材牌号Q235、Q345、Q390是根据材料（）命名的。

钢材牌号Q235、Q345、Q390是根据材料（）命名的。

试解释Q345钢与Q235钢的含碳量基本相同，但前者的强度明显高于后者。

试解释下列现象：Q345钢与Q235钢的含碳量基本相同，但前者的强度明显高于后者。

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.

The （） is used for hauling in or letting out the wires or ropes.

Vessels must be（）valid certificate of nationality or certificated of registry or license.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。