The treatment time is the most important factor to keep the effective concentration of Phosphine.
处理时间是保持磷化氢有效浓度的重要因素。
In some cases, even a low concentration of green tea was effective.
在某些例子中，即便是低浓度的绿茶都有效果。
The seam water injection is an effective measure to control coal dust concentration.
煤层注水是降低矿井粉尘浓度的有效措施之一。
Productive high concentration effective, saving occupied area, easy operation and maintenance.
具有生产效率高，浓缩效果好，节省占地面积、操作维修方便等特点。
Productive high concentration effective, saving occupied area, easy operation and maintenance.
具有生产效率高，浓缩效果好，节省占地面积、操作维修方便等特点。
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