交感神经支配的支气管平滑肌上具有（）型受体。
A.α1
B.α2
C.β1
D.β2
参考答案：D
Brain twister.（脑筋急转弯）
1. When do dogs have eight legs?
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2. What is black when it's clean but white when it's dirty?
3. What letter is an anima ?
4. What letter is a question?
简述证券投资基本面分析的主要内容？
