单项选择题
A.2Dg B.3Dg C.3.5Dg D.4Dg
A.2 B.2.5 C.1.5 D.3
A.1 B.10 C.100 D.1000
A.55-65°C B.66-72°C C.72-82°C D.82-88°C
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