不同的显示器有其相应的控制电路，这个控制电路部件的英文术语的缩略语不包括（）。
A.CGA
B.EGA
C.VGA
D.DGA
参考答案：D
在Internet中，______拨号协议支持LCP层的差错检测。
A．SLIP B．PPP C．NCP D．CSMA
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
