单项选择题

以下哪种药物躯体依赖性最低（）

A.吗啡
B．杜冷丁
C．喷他佐辛
D．诺扬

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单项选择题

Question 4: Read the passage name "Reading material of online test for class 174" on Mooc and answer the following five questions: 1.The cost-reduction can be best achieved by ( ).

A、the retailer in his store
B、cooperation between wholesaler and retailers
C、competition between manufacturer and retailers
D、cooperation between manufacturer and distributors

单项选择题

氧疗法中,流量为4L/min,其氧浓度为（）

A.21%
B．30%
C．33%
D．37%
E．39%