边际资本成本的权数采用( )权数。

A．目标价值

B．市场价值

C．账面价值

D．历史价值

●Documentation of a software package is normally produced for two purposes.One is to explain the __(71)__ of the software and describe how to use them.This is known as__(72)__because it is designed to be read by the user of the software.The other purpose of documentation is to describe the software’s internal composition so that the system can be maintained later in its lifecycle. Documentation of this type I sknownas __(73)__.

A．system documentation

B．user documentation

C．vender documentation

D．product documentation