正确答案:

乙酰胆碱

B

题目：直接激动M、N受体的是

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延伸阅读的答案和解析：

[多选题]蒙医用药法规定。应从小剂量试服至常用量的有（ ）。

有毒类药

峻烈类药

过寒性药

过热性药

解析：蒙医用药法规定，应从小剂量试服至常用量的有：有毒类药，峻烈类药，过寒性药，过热性药。

[单选题]请根据以下内容回答 60～64 题

An organ of higher plants， usually subterranean and having several functions，including the absorption and conduction of water and dissolved minerals， food storage，and anchorage of the plant in the soil. It is distinguished from the stem by its structure，by the manner in which it is formed， and by the lack of such appendages as buds and leaves.

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