单项选择题
A.18.2% B.18.5% C.18.9% D.20.1%
A.210℃ B.215℃ C.220℃ D.225℃
A.99.80% B.99.90% C.99.95% D.99.97%
A.20N/cm B.25N/cm C.15N/cm D.18N/cm
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