在下列河流中，流入北冰洋的河流是（）

北冰洋的四季是如何划分的？

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.

第一个打通了北冰洋西北航线的航海家是（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

（）属北冰洋水系的高山湖，该湖是一个变色湖。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

俄罗斯位于北冰洋沿岸的港口是（）