Configuration management system can be used in defining approval levels for authorizing changes and providing a method to validate approved changes. ______ is not a project configuration management tool.

A．Rational Clearcase

B．Quality Function Deployment

C．Visual SourceSafe

D．Concurrent Versions System

下列关于胶剂的叙述错误的是（）。

A.服用时需烊化

B.浓缩收胶时，可加入白酒

C.驴皮以冬板质量最好

D.质量检查时不检查水分