（）子主要与繁衍后代有关，称为繁殖器官。

在择偶中，性别偏好的演化与男性和女性在繁衍后代任务中扮演不同角色是（）的。

“种”是指在一定的自然分布区域中，形态特征相似，能相互交配、正常繁衍后代的类群。

可以在（）阶段采用Make-or-buy决策分析。

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。

性别是人口的基本特征之一。正常的性别比是每出生100个女婴，就会出生103～107个男婴。这个性别比例是人类在长期进化过程中形成的自然选择，这个比例偏高和偏低都不利于人类的繁衍和社会的稳定。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。