The U. S. government falls into three branches: the legislative, ______ and the judicial.
A. the representative
B. the democratic
C. the executive
D. the independent
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以下哪种结构含骨小梁
A. 固有牙槽骨
B. 密质骨
C. 松质骨
D. 以上均有
E. 以上均无
According to the passage, an unlabeled use of a drug is any use which______.
A. has been reviewed by the FDA and specifically rejected
B. has medical value but has not yet been approved by FDA for inclusion as a labeled use
C. is authorized by the label as approved by the FDA on the basis of scientific studies
D. is made in experiments designed to determine whether a drug is medically beneficial
调和模型石膏时，调拌速度过快，将导致
A. 强度增加，膨胀减少
B. 强度降低，膨胀增加
C. 强度增加，膨胀增加
D. 强度降低，膨胀减少
E. 硬度增大，强度增加
将特定编码蛋白的外源基因直接导人动物细胞内，诱导宿主对目的基因表达的蛋白产生免疫反应，达到防龋作用的疫苗是
A. 单克隆和多克隆抗体
B. 多肽抗体
C. 基因重组免疫
D. 核酸疫苗
E. 转基因抗体
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