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。
The chemical property of formation water in oil layer might be equal to that of adjacent water layer 油层中地层水的化学特性可能等同于临近水层的化学特性，当地层水与其宿主岩的形成时间不同时，就可能与之完全不同。
The symptom is that the top of kelp leaf turned from brown to white gradually , at the same time , the leaf is rot and fall off 病状为藻体从叶片尖端开始逐渐由褐色变白色并腐烂脱落。防治措施：适时下调水层，加快收割。
The premium fish food is easily digested , and is ideal for most top and mid - water feeders , but is not a suitable form for bottom feeders 热带鱼用鱼片嗜口性非常好，更适合在水层上层和中层觅食的鱼类，但不适合在底层觅食的鱼类
Each fish species has a preferred water layer where it spends most of its time : near the surface , in the middle , or near the bottom 每一种鱼都有偏好的水层，它们大部分时间都会呆在那儿：接近水面的上层水区、中层水区、或是接近水底的底层水区。
The function of diffusion layer and hydrophobic layer is affected by channel and depends on the pore diameter , the porosity and the thickness of diffusion layer and catalyst layer 扩散层和疏水层对气体作用的结果受流道影响，取决于孔径、空隙率和厚度的变化。
