若需要从多个可能的影响因子中筛选少数关键因子，可选的工具有（）
A.相关分析
B.回归分析
C.控制图
D.部分因子试验设计
参考答案：A, B, D
On their _____ to the mountainous village, they were caught in a heavy rain, but they didn't give up half
way, and made up their _____ to get there in time to rescue the people there. [ ]
A. way; mind
B. ways; minds
C. ways; mind
D. way; minds
带电作业如遇（）等天气，不准进行带电作业。
A.雷电
B.雨天
C.阴天
D.大雾
