在黑龙江地区历史上被称为“东海圣国”的是（）历史时期。

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 （）.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

秦汉管理少数民族地区采取了哪些灵活方式？

秦汉至南北朝时期，出现了中国一次规模很大的民族迁移，当时，原居住在中国北方和西部的一些少数民族主要有（　　）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。