完全放入水中的平板，如果平板的形心相对水面的深度不变，那么在木板做无规则转动时（木板不露出水面），作用在木板上的静水总压力（）。

y轴过平面图形的形心,则该图形对y轴静矩。 ( )

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。

高层结构基础底面积的形心，应与上部结构准永久荷载的合力中心相重合。（）

摩擦是一门新兴学科，它涉及数学、力学、物理、化学、冶金学、石油学、化学工程等学科。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。