研究发现，控制最大颗粒的粒径，可有效地消除抛光的划痕现象。
The scratch in the polishing process is investigated and it is shown that the polishing scratch is mainly dependent on the coarse particles and can be eliminated by accurate classification.
在处理之前，先要将土壤进行预处理，使得土壤的含水率、土壤最大颗粒直径、pH值、粘土含量等适宜于之后的处理。
Before the disposal, make preparatory treatment of the soil to ensure the water content, maximum particle diameter, pH value, clay content of the soil are suitable for the following disposal.
在处理之前，先要将土壤进行预处理，使得土壤的含水率、土壤最大颗粒直径、pH值、粘土含量等适宜于之后的处理。
Before the disposal, make preparatory treatment of the soil to ensure the water content, maximum particle diameter, pH value, clay content of the soil are suitable for the following disposal.
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