国际遗传育种学界最流行的一句话是：“谁掌握种质，谁就掌握未来”！

国际遗传育种学界最流行的一句话是：“谁掌握种质，谁就掌握未来”!

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.

近交系动物发生遗传变化的主要原因是环境发生了变化。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

以下不是动物实验的主要用途的是（）

动物实验的主要用途有哪些?

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。