单项选择题
A.15%-28% B.13.5%-79% C.14%-29%
A.3.4%-27% B.3.5%-28% C.3.4%-29%
A.0.5Mpa B.0.6Mpa C.0.7Mpa
A.爆炸性 B.有毒性 C.可燃性
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