判断题

对于一般毒性评价和研究，应尽可能使用清洁级以上的动物，以保证结果的可靠性。

答案：正确

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单项选择题

If you ______, I would have told you.

A． asked
B． have asked
C． had asked
D． would have asked

液压泵是把原动机的（）转变为液压油的（）的能量转换装置。

答案：机械能;压力能