单项选择题
A.5 B.10 C.15
A.20-30% B.30-40% C.40-50% D.45-50%
A.8-10 B.10-12 C.15-20 D.20-30
A.>150℃ B.125--140℃ C.140--150℃ D.110--115℃
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