补中益气汤和清胃散中均有的是（）
A.牡丹皮，当归
B.升麻，当归
C.黄连，生地黄
D.朱砂，生地黄
E.黄芪，柴胡
参考答案：B
The price of product Z decreased from $ 2.50 per unit to 2.00 per unit. Since the price decreased, demand has gone up from 3 million units to 4 million units. Calculate the price elasticity of demand and determine if the demand is elastic or inelastic.Price elasticity of demand Elasticity（）
A. -1.29 elastic
B. -2.00 inelastic
C. -1.29 inelastic
在期货交易中（）是会员单位对每笔新开仓交易必须交纳的保证金。
A.基础保证金
B.初始保证金
C.追加保证金
D.变更追加保证金
