简述需求价格弹性的类型。

—                  

—  I mean the best way is using your own mobile phone or computer to operate it. 

总需求的构成（    ）

—Can you tell us why you think this makes good business sense to you?
—We've been doing quite well on our own and we could probably survive like this for quite a few more years to come, but if we really want to take it to the next level, ____________.

Travelers can sign on the checks whenever they have time.

确定主管人员的需要量应该考虑以下因素：（    ）。

在完全竞争市场上，无论是产品市场还是要素市场，其价格都是一个常数。

在下列领域中，古利克的个人兴趣一直都主要在（ ）。

该零件尺寸主基准是轴心线和（　）。

We must keep our classroom _____________.