【判断题】弧弹性系数对曲线型需求曲线的点弹性系数的估计在弧长变短和弧的曲率变小时将得到改善。
【单选题】According to a concerned 1997 article in the Boston Globe, the United States spent less than one percent of its transportation budget on facilities for pedestrians (行人). Actually, I'm surprised it was...
A.
the government spends too much on facilities for pedestrians
B.
the government spends just enough on facilities for pedestrians
C.
the amount is more than he has expected
D.
the amount is less than he has expected
【单选题】弧弹性系数对曲线型需求曲线的点弹性系数的估计在下列哪种情况发生时将得到改善( )。
【单选题】Why are scientists concerned about the population of California sea otters according to the passage?
A.
It has been growing at too fast a rate.
B.
Its growth rate has been steadily decreasing.
C.
Its growth rate is not as fast as that of the Alaska sea otters.
D.
It has been greatly reduced by oil spills and other forms of pollution.
【单选题】弧弹性系数对曲线型需求曲线的点弹性系数的估计在下列哪种情况发生时将得到改善?( )。
【单选题】弧弹性系数对曲线型需求曲线的点弹性系数的估计在 ( )发生时将得到改善。
【判断题】In the 19th century linguistic study was primarily concerned with synchronic descriptionIn the 19th century linguistic study was primarily concerned with synchronic description
【单选题】关于Warthin瘤发病的叙述,不正确的是
E.
Warthin瘤占唾液腺上皮性肿瘤的9.5%
【单选题】赵本山创造了一个又一个文化传奇。他之所以能有今天的成就,源于他始终对农村、农民怀有很深的感情,从黑土地上获得了丰富的营养,从民间文化中汲取了精华,民间艺术正是他艺术创作中一条割不断的血脉。据此回答题。这一事实主要说明()