单项选择题
A.2g/LB.4g/LC.8g/LD.12g/L
A.2g/LB.4g/LC.6g/LD.8g/L
A.10~12℃B.14~16℃C.18~20℃D.24~26℃
A.2.5~5.5%B.8.9~14.5%C.10.3~25.8%D.52.9~64.1%
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