爆炸性气体环境，是指大气条件下气体、蒸气或雾状的可燃物质与空气混合物点燃后，燃烧将传至全部未燃烧混合物的环境。（）
参考答案：对
______ being an outstanding physician and scientist, he was an accomplished writer and a gifted artist.
A．As far as
B．As well as
C．As soon as
D．As long as
区间估计
