达西定律是土中水渗流时的基本规律。

渗透试验根据达西定律来测定（）数，从而确定土的渗透性大小。

用达西定律计算出的渗透流速是不是土中的实际流速？如果不是，它们在物理概念上有何区别？

什么是达西定律？室内测定岩土的渗透系数的基本原理和方法是什么？

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.

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。