means that-
应用在流程控制统计表中的 “七规则＂指的是[ d or b ]

a. Seven rejects typically occur per thousand inspections
每一千个检测点会产生7个不符点
b. Seven consecutive points are ascending, descending, or the same
7个问题点可向上、向下或重叠分布
c. At least seven inspectors should be in place for every thousand employees
每一千个员工就应有7个质检员
d. A process is not out of control even though seven measurements fall

outside the lower and upper control limits
尽管7个检测点都落在上、下界线控制处，但过程仍在控制中