何为共生？为什么在生态工程建设中必须遵循互利共生的原则？

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.

何为屏蔽系数？何为屏蔽地线的屏蔽效应？

何为癌细胞？癌细胞的基本生物学特征包括那些？

何为癌细胞？癌细胞的基本生物学特征包括哪些？

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

以工程为基础，运用生物学、生态学特性，将园林艺术和市政工程融为一体，使工程设施和园林景观相互协调，充分发挥园林的生态、经济、社会效益的功能，这种工程称为（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。