什么是土木工程的四大结构?

土木工程结构试验设计中,试件设计的基本要求是什么? 

钢结构土木工程在使用中区别于其他土木工程应该注意的主要问题是（）。

灾害材料学一般涉及到土木工程材料的一般力学性能有（）等等。

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。

自由液面是水平面。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。