下列印模材料中属水胶体弹性可逆印模材料的是
A. 藻酸盐印模材料
B. 硅橡胶印模材料
C. 琼脂印模材料
D. 聚醚橡胶印模材料
E. 印模膏
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
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
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