题目内容
（请给出正确答案）
[主观题]
Quality control charts show a characteristic of the product or service against:A.the speci
Quality control charts show a characteristic of the product or service against:
A . the specification limits
B . customer requirements
C . control limits based on three standard deviations in each direction
D . control limits based on six standard deviations in each direction
E . A and D only
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