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【单选题】
为了实现研究的目的，动物模型的正确制作及正确使用是非常重要的。因此在模型设计时要遵循下列一些原则。复制的动物模型来应该力求可靠地反映人类疾病，即可特异地、可靠地反映某种疾病或某种机能、代谢、结构变化，应具备该种疾病的主要症状和体征。称为（）原则。A.
相似性
B.
重复性
C.
可靠性
D.
适用性和可控性
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举一反三
【判断题】BOD5与总氮的比例制约了污水中反硝化菌的量,BOD5与总氮的比在1~3之间时,好氧可相当于单独硝化; BOD5与总氮的比在5以上时,完成反硝化需外加炭源。
A.
正确
B.
错误
【简答题】Passage 2 Even though e-commerce has been around for a long time, only 5% of all goods produced are bought online. But e-commerce is still growing. It is breaking into traditional markets more than ev...
【简答题】The first time we started using it, we thought it would just be a bit of fun, a one-time thing. “Let’s just give it a try,” my fiancée said. I was a bit nervous, but I knew some of our friends were al...
【单选题】_____ that story book was indeed very popular, but it was not long before the demand declined.
A.
Finding my way
B.
All the way
C.
In the absence of
D.
For a while
E.
On the point of
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