运输需求价格弹性系数的绝对值等于1的弹性,称之为( )
A.完全无弹性B.完全有弹性C.单位弹性D.富有弹性
参考答案:C
10KV电力变压器过负载保护动作后,经一段延时发出警报信号,不作用于跳闸。
---When did the young man save you?
---January 1st,2000, the first day of the new century,_______ I can never forget.
A.when
B.which
C.that
D.where