煤的视（相对）密度是指（）时煤（包括孔隙）的质量与同体积水的质量之比，过去叫视比重。

在一定条件下，流体可以在岩石中流动的孔隙体积与该岩石（样）总体积的比值是（）。

在一定条件下，液体可以在岩石中流动的孔隙体积与该岩石（样）总体积的比值是（）。

岩石饱和吸水率是试件在（）下的最大吸水量与试件固体质量的比值。

比值比（OR）

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。