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问题 单项选择题

吗啡急性中毒引起的呼吸抑制宜用：

A．咖啡因

B．贝美格

C．派醋甲酯

D．尼可刹米

E．山梗菜碱

答案

参考答案：D

选择题
一 Are you going to further your studies after graduation?
一 Well, I _____ yet. I might make some other choices.

A. didn't decide
B. haven't decided
C. don't decide
D. hadn't decided
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单项选择题

牙周组织和牙髓组织的交通途径不包括（）

A.根尖孔

B.侧支根管

C.副根管

D.牙本质小管

E.牙周膜
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