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【单选题】
毒理学鼻祖 Paracelsus 提出"剂量决定毒物",即所有物质一定毒性,惟有剂量能区别毒物。因此,自毒理学诞生之日起,剂量-效应(反应)关系便是研究的核心 .卫生毒理学中较为常见的剂量反应曲线为A.
直线型曲线
B.
抛物线型曲线
C.
S状曲线
D.
对数曲线
E.
正态曲线型
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A.
in where
B.
where
C.
which
D.
what
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A.
The library has already chosen some people to work there.
B.
She is going to give the man a job offer.
C.
The library is looking for more applicants.
D.
The man should hurry up.
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A.
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B.
当纵向拉力Ｎ作用在钢筋As合力点及As·的合力点范围以内时
C.
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D.
x
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A.
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B.
强化财务的造血机制
C.
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D.
提升企业财务的协调能力
E.
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