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[主观题]
当二氧化碳在空气中浓度达到()时,绝大多数的燃烧都会熄灭A.10%~30%B.20%~30%C.30%~50%
当二氧化碳在空气中浓度达到()时,绝大多数的燃烧都会熄灭
A.10%~30%
B.20%~30%
C.30%~50%
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当二氧化碳在空气中浓度达到()时,绝大多数的燃烧都会熄灭
A.10%~30%
B.20%~30%
C.30%~50%
A.1.5
B.1
C.0.5
A.0.5
B.1.0
C.1.5
D.2.
A.4.0~46.0
B.2.2~9.7
C.1.2~8.0
D.2.2~78.0
A.50m
B.100m
C.200m
D.500m
E.1000m