特布他林的平喘机制是(E)A、阻断支气管平滑肌上的M受体B、促进内源性儿茶酚胺类递质释放C、阻断腺苷

特布他林的平喘机制是(E)A、阻断支气管平滑肌上的M受体B、促进内源性儿茶酚胺类递质释放C、阻断腺苷受体D、稳定肥大细胞膜E、激动支气管平滑肌上的β2受体

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7. The opening ceremony is a great occasion. It is

7. The opening ceremony is a great occasion. It is essential ____for that. A. fo

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