简述国际经济合作与国际贸易的联系。

翻译：With Average or With Particular Average（WA or WPA）（）

简述布尔算符（OR）的作用。

产生国际重复征税的前提条件是（）

简述国际贸易产生的前提。

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.

商品经济产生和存在的前提条件是（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

简述马克思主义哲学产生的自然科学前提和理论来源。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。