硝酸酯类药物舒张血管的作用机制是（） A.阻断β受体 B.直接

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问题单项选择题 A1型题

硝酸酯类药物舒张血管的作用机制是（）

A.阻断β受体

B.直接作用于血管平滑肌

C.促进前列环素的生成

D.释放一氧化氮

E.阻滞Ca²⁺通道

答案

参考答案：D

选择题

--How much ________ this pair of trousers? - Ten dollars _______ enough.

A．are, is

B．is, are

C．are, are

D．is, is

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单项选择题

Some of the low-end Made-in-China mechanical-electronic products are not selling well in export market as compared with what are termed as high-end ones.