针对设计变更管理，业主项目部应建立（），以便统计变更及累计费用。
A.监督机制
B.预警
C.变更管理台账
D.档案记录
参考答案：C
Although Rio knew little about marketing, he succeeded _____ other more well-informed managers failed. [ ]
A. as
B. unless
C. what
D. where
