边界条件表示边界（），或（）之间的关系式。分为（）、应力边界条件和混合边界条件。

位移边界条件和载荷边界条件的意义是什么？

映射法的基本原则是要求映射后，所得的无限含水层中的渗流问题，应保持映射前的边界条件和水流状态。

渗流达西定律适用的条件是恒定均匀层流渗流，并且无渗透变形。（）

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.

When loading or discharging dry mud or cement，crew members should use goggles and（）.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。