A.7.74%~35.31% B.13.5%~88% C.40%~73.5%

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问题 A.7.74%~35.31%B.13.5%~88%C.40%~73.5%D.19%~71%

选项 A.7.74%~35.31%
B.13.5%~88%
C.40%~73.5%
D.19%~71%

答案 D

解析 发生炉煤气的火焰传播极限为:L1=100/[(12.4+6.2)/6.0+(27.3+53.4)/40+0.7/5.0]=19%Lh=100/[(12.4+6.2)/70+(27.3+53.4)/73.5+0.7/15.0]=71%
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