电负性（）的活泼非金属元素的原子与电负性（）的活泼金属元素的原子通过（）得失形成（）。

氢键是H与电负性很大的元素原子间以共价键结合的同时又与另一个电负性小的元素原子间产生的吸引作用。

当H原子与电负性很（），半径很（）的X原子（如F、O、N原子）形成H-X共价键时，还能去吸引另外一个电负性很（），半径很（）的Y原子产生静电作用，从而形成氢键。氢键通常用X-H…Y表示。

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。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。