液体在圆管中作层流运动时,液体在圆管轴线上的流速与在圆管管壁附近的流速相比( )

由于流体作非定常流动或运动物体在流体中作加速运动所引起的阻力，称为兴波阻力。

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.

盛有液体的容器以重力加速度自由下落，求： ⑴液体内各点的压强； ⑵若容器以竖直向上的加速度a上升，求液体内压强随深度的分布； ⑶若容器以竖直向下的加速度a（

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

当导体在磁场中作（）运动或在线圈中作（）运动时会产生电流。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

布尔逻辑具体检索时，是通过三个布尔运算符来实现其功能的：AND、OR、（）。