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。

山西大学改为国立后，工学院存在哪些系？（）

自由空间的路径损耗与（）、距离有关。

自由空间的传播损耗Lbs=（）。

（）在真空中的传播称为自由空间传播，直射波可近似按自由空间传播来考虑。

微波在自由空间的传播主要方式是（）传播。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。