在煤矿安全问题中，瓦斯气体浓度是煤矿安全监测的重要指标之一。
In coal mine safety problem, gas strength is one of an important safety inspection factors.
试验浓度范围内对黄瓜苗安全。
It was also safe to cucumber seedling in the range of trial concentration.
试验浓度范围内对黄瓜苗安全。
It was also safe to cucumber seedling in the range of trial concentration.
应用推荐