假定某种物品价格从5.5上升到6.5,需求量从12500减少为11500单位,在需求曲线范围内,需求的价格弹性为()
A、1.0
B、2.0
C、0.5
D、20
参考答案:C
With the farmer ______ the way, we got to the village before dark. [ ]
A. leads
B. led
C. having led
D. leading
恒压力磨削时,砂轮以一定的背向力压向工件,机床采用()控制,自动完成磨削循环。
A.机械
B.电气
C.电液
D.液压