单项选择题
A.175~180℃ B.75~80℃ C.50~60℃ D.37~38℃
A.0.5~1倍 B.1~1.5倍 C.1.5~3倍 D.1.5~2倍
A.10~20s B.20~30s C.3~5s D.1~2s
A.3%~4% B.5%~10% C.10%~12% D.20%~15%
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