But the concentration of nh4 + decreased to the very low level in 7 - 10 days after fertilizer was applied 而田表水层中铵态氮浓度在施肥后第7 ? 10天左右均降至很低水平。
Landfill cover ( bentonitelining ) , landfill gas system , landfill leachate control system , landfill lining 、堆填区气体系统、堆填区渗漏污水控制系统、堆填区阻水层
The middle aqueous layer provides moisture and supplies oxygen and other important nutrients to the cornea 中间的眼房水层提供了水分、氧气和其它角膜需要的重要的营养物质。
When the backing is a double - shell , the water layer causes obvious modulation phenomenon to the absorption coefficient curve 背衬为双层壳体时,水层对吸声覆盖层的吸声系数曲线有明显的调制现象。
The results are helpful for further understanding of pore forms and for accurately dividing the rich water - bearing layers in red - bed 所获结果对于深化认识红层孔隙形态、精确划分富水层段位置等具有重要指导作用。