语言发展演变的两大特点是什么？

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（）.

Effects which are dutiable or subject to prohibitions or restrictions should be declared in （）.

（）和（）是语言结构的两大基本关系。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

语言是人类社会的（）工具，而且也是（）的工具，这是语言的两大社会功能。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。