（）, 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.

飞机是谁发明的？（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

标志世界近代史开端的事件是（）

作为世界近代史开端的标志是（）

简述世界近代史中存在的三大世界性矛盾。

吴齐本对世界近代史是怎样分期的，其理由是什么？

为什么说1500年左右是世界近代史的开端？

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。