sand break

The experiment of breaking the ranks and the thermogravimetric analysis show that the phenol formaldehyde resin begins to decompose when the temperature is above 500 degree centigrade, which make the sand-core break the ranks.

溃散性试验和TG分析结果表明，三种覆膜砂表面的酚醛树脂均在500℃以上产生分解，从而使泥芯产生溃散。

"Dig: To break up, turn over, or remove ( earth or sand, for example), as with a shovel, a spade, or the hands."

“挖，掘：用铁锨、铲或手挖、翻或移走（例如泥土或沙子）.”

Formed of the sand, and fit to shift and break.

却就象一堆虚浮不实的泥沙!

Oil extraction wastewater treated by oil removal-chemical break-emulsification coagulation-sand filtration process, removal rate of COD oil could reach above 85% 95% respectively, COD in purified water could not attain to national standard of discharge, but oil concentration could attain to national standard of discharge;

经过隔油-破乳絮凝-砂滤处理后，COD和油去除率分别达到85%和95%以上，COD没有达到排放标准，油达到了排放标准；

Experimental study for the break angle and the breaking up of the shallow tunnel in soil and sand interbed

土砂互层中浅埋隧道破裂角及破坏试验研究