水力粗糙管紊流也称为（）。

比值比（OR）

紊流中粘滞底层厚度 比绝对粗糙高度 大得多的壁面称为 ( )

河流的自净能力要比湖泊和水库大得多，受干扰后恢复能力也强。（）

英国议会上院的个人影响比集体影响要大得多。

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.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

什么叫做埋弧焊？与焊条电弧焊相比，埋弧焊的冶金过程有哪些特点？为什么埋弧焊时允许使用比焊条电弧焊大得多的焊接电流和电流密度？

过渡粗糙管紊流中，有（）同时起作用。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。