单项选择题
A.40Mpa B.50Mpa C.60Mpa D.80Mpa
A.90% B.95% C.97% D.100%
A.20±2摄氏度 B.22±2摄氏度 C.20±5摄氏度 D.20±1摄氏度
A.90s B.100s C.120s D.150s
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