简述汉字的性质及其古今发展演变线索。相关试题：（1）阐述汉字形体的历史变革。（2）汉字的历史演变过程。

试题的层次参数使试题具有了可对比性，提高了试题资源的有效价值

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.

当代大学生的历史使命是什么？

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

中外历史学发展历程大致经历了（）

当代大学生的历史使命和成才目标是什么？

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。