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问题 名词解释

焦油沥青

答案

参考答案：

焦油沥青为各种有机物（如煤、泥炭等）经干馏加工得到的焦油。

单项选择题

Questions


·Look at the questions for this part.
·You will hear a passage about job. You will listen to it twice.
·For questions , indicate which of the alternatives A, B, or C is the most appropriate response.

At one time, Rodney Mace ______.

A. spent all his time writing books
B. taught architecture and history
C. had a full-time job
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单项选择题

目前我国的（）通常饲养在较为开放的饲养环境中，经常可能有携带病原体的各种媒介昆虫及野鼠进入，导致把各种病原体传染（感染）实验动物。

A.SPF实验动物

B.隔离环境动物

C.普通实验动物

D.悉生动物
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