阿托品扩瞳的机制是( )；去氧肾上腺素扩瞳的机制是( )。去甲肾上腺素的用途是( )和( )。
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Which of the following is NOT a research finding about "drinking with meals"？
A. It lowers cancer risk compared with drinking without food
B. It increases by 20 percent the risk of cancer in all the four sites
C. It may be a cause of cancer
D. It does not eliminate cancer risk at any of the four sites
合成乙酰胆碱的酶称为( )；在神经末稍水解乙酰胆碱的酶称为( )。
贷款服务机构为发起机构的，可以不与受托机构签署贷款服务合同。（）
套利的理论基础在于经济学中所谓的（）。
A. “看不见的手”原理
B. 一价定律
C. 报酬边际递减规律
D. 完全竞争市场理论
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