不同阶层的领导者所需能力结构是有差异的。对于高层领导者而言，最重要的能力是（）。

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。

不同社会阶层消费者的心理与行为差异。

意见领袖与意见跟随者处于不同的社会阶层。

处于同一社会阶层的人其相互影响（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。