从皮亚杰的认知发展阶段论看来，中学生的认知发展属于（）。

在皮亚杰的认知发展理认中，大学生处于（）阶段。

可以在（）阶段采用Make-or-buy决策分析。

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.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

根据皮亚杰的认知发展阶段论，6岁的儿童处于认知发展的（）期。

根据皮亚杰的认知发展阶段论，6岁的儿童处于认知发展的（ ）期。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。