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【单选题】
在某个时期内,个体对某种刺激特别敏感,过了这个时期,同样的刺激则影响很小或没有影响,这个时期称为:
A.
刺激期
B.
发展期
C.
关键期
D.
潜伏期
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D.
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【单选题】用于预防结核病的卡介苗是经反复传代培养而获取的毒力减弱而抗原性保留的变异株，其变异是
A.
形态与结构变异
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C.
耐药性变异
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E.
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【单选题】Reading is very important in learning foreign languages. Do some foreign language reading every day and try to finish one foreign language book at【C1】______every week. You are no doubt【C2】______, with...
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【简答题】阅读理解。 Saying 'thank you' is probably the first thing most of us learn to do in a foreign language. After all, we're brought up to be polite, and it is important to make a good impression upon other pe...
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查看完整题目与答案
【简答题】17【单选题】关于I型肺泡细胞,不正确的是
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