自然保护区一般可进一步划分为（）
A.核心区
B.缓冲区
C.边缘区
D.试验区
参考答案：A, B
（） is the application of planned, systematic quality activities to ensure that the project will employ all processes needed to meet requirements.
A．Quality assurance (QA)
B．Quality planning
C．Quality control (QC)
D．Quality costs
“短平快”战术
