劳动力供给弹性是指（）。

A.劳动力供给的数量随着工资率变动而发生变动的灵敏程度

B.它不会通过改变工资水平来改变劳动力供给水平

C.工资率的上升总是会带来劳动力供给量的增长

D.工资率变动不会带来劳动工时的任何变动

Documentation of a software package is normally produced for two purposes.One is to explain the(1)of the software and describe how to use them.This is known as (2)because it is designed to be read by the user of the software.The other purpose of documentation is to describe the software's intemal composition so that thesystem can be maintained later in its life cycle.Documentation of this type is known as(3)

空白（3）为（）

A.system documentation

B.user documentation

C.vender documentation

D.license documentation