易升高肾素活性
A．呋塞咪B．肼屈嗪C．普萘洛尔D．卡托普利E．硝普钠
参考答案：B
苯甲酸的防腐作用主要靠解离的分子.
Which of the following is least accurate regarding the allocative efficiency associated with price discrimination Price discrimination:（）
A. results in gains to the discriminating firm by selling to consumers with relatively inelastic demand.
B. increases production closer to the quantity where price equals marginal cost.
C. leads to a decrease in allocative efficiency.
