药品采购应遵循的原则包括（）
A.质量第一
B.价格合理
C.对药品供应商资质论证
D.国营渠道进货
E.计划采购
参考答案：A, B, C, E
若标准宗地的临街深度为10m，按照四三二一法则计算临街深度为15m的宗地价格，其平均深度价格修正率为( )。
A．78%B．85%C．117%D．150%
If the price of product X increases from $2.00 per unit to $ 2.25 per unit, the demand will decrease from 7.5 million units to 6.7 million units. What is the price elasticity of demand for the product, and is the demand for the product elastic or inelastic（）
A. -1.04; elastic.
B. -0.96; elastic.
C. -0.96; inelastic.
