单项选择题
A.80℃ B.40℃ C.60℃ D.50℃
A.60% B.70% C.80% D.90%
A.10~15 B.15~20 C.20~25 D.25~30
A.3/1000 B.1/1000 C.5/1000 D.10/1000
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