单选题:牛黄具有解痉作用,其对平滑肌的松弛作用主要是由哪个成分引起的

题目内容:
牛黄具有解痉作用,其对平滑肌的松弛作用主要是由哪个成分引起的 A.SMC
B.去氧胆酸
C.胆红素
D.石胆酸
E.胆酸

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答案解析:

What attitude did the man‘s parents have towards his study a

What attitude did the man‘s parents have towards his study abroad?A.They allowed

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