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【多选题】
镇痛药的镇痛机制是A.
通过脑内释放脑啡肽等物质与突触后膜阿片受体结合，使痛觉传递受抑制
B.
通过中枢某部位释放抑制性NM-DA、Ach增加对痛觉的抵抗力，产生镇痛
C.
通过脑内释放脑啡肽等物质与突触前膜阿片受体结合，产生突触前抑制，防止痛觉传入
D.
与相应膜受体结合，关闭Ca抖通道，阻断痛觉传递
E.
以上
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【简答题】简述微生物的抗药性原理有哪些?
【简答题】阅读理解。 Elephants use their trunks (鼻子) the way people use their hands. At the end of the trunk are parts that act like fingers. These allow elephants to do wonderful things. They pick up their food-par...
【单选题】What does the metaphor that "English is a like a tree with a trunk and some branches while Chinese sentence is like a clump of bamboo" show about the differences in English and Chinese languages?
A.
The differences of stress-beginning sentence and stress-ending sentence.
B.
The differences of hypotaxis and parataxis.
C.
The differences of passive voice and active voice.
D.
The differences of linear and spiral discourse.
【简答题】Like the trunk of a tree, it rose in the air, branching out as it climbed. (para, 12)
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