自然科学的四大门类即基础科学、农业科学、工程科学和医学科学。

材料科学与工程有四个基本要素，它们分别是：使用性能、材料的性质、（）和（）。

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.

装饰材料是（）的一个分支，它是饰面材料，是建筑装饰工程的基础。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

下列哪种材料为漫反射（均匀扩散反射）材料？（）

下列哪种材料属于较理想的扩散透射材料？

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。