当构件轴心受压时，对于双轴对称截面，可能产生（）；对于无对称轴的截面，可能产生（）；对于单轴对称截面，则可能产生（）

单轴对称截面的轴心受压构件，当构件绕对称轴失稳时发生（）屈曲

双轴对称焊接组合工字形截面偏心受压柱，偏心荷载作用在腹板平面内。若两个方向支撑情况相同，可能发生的失稳形式为（）

单轴对称的轴心受压构件，当绕对称轴失稳时，其整体失稳形式通常是（）

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。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。