单项选择题
A.12s B.12.5s C.13s D.13.5s E.10.05s
A.Belk和Sunderman B.Levey和Jennings C.Westgard D.Whitehead E.Shewhart
A.1% B.2% C.5% D.8% E.10%
A.99.73% B.50% C.68.27% D.95.45% E.99%
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