为什么经济学家反对限制各国之间贸易的政策？

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。

战略性政策贸易理论认为，产业实现规模经济的最快及最佳的途径（）

试述对外贸易对我国国民经济发展的重要战略作用。

李斯特的“经济发展阶段论”认为应实行贸易保护政策的经济发展阶段/时期是（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

简述战略性贸易政策实施的限制条件。