单项选择题

某大型项目进行到两年时,使用挣值法所需的三个中间变量的数值分别是:计划值PV为400万元,实际成本AC为200万元,挣值EV为100万元。基于该项目的成本偏差,下列描述中正确的是 38 ;基于该项目的成本绩效指数,下列描述中正确的是 39 。Quality planning tools are often used to help plan effective quality management activities. ______ is one of such tools, which involves comparing actual or planned project practices to those of other projects to generate ideas for improvement and to provide a basis by which to measure performance.

A. Benchmarking
B. Quality metric
C. Quality checklist
D. Brainstorming
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