我国从唐朝中后期开始的经济重心南移最后完成于（）

妊娠中后期，卵巢上黄体开始退化的动物是（）

春秋中后期开始，（）没有变得比较强盛。

妊娠中后期，卵巢上黄体开始退化的动物是

《历史的窗纸》是孟超史论性杂文的代表作，它从一个大学招考的历史试题谈起。

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。