These factors must be balanced by the selection of diamond grade and concentration that will provide the operator with optimum performance at a suitable cost.
这些因素必须同时顾及挑选钻石分级及浓度，将提供最佳的营表现在一个适当费用。
2
The effect mechanism of separating performance and grade efficiencies of the dust concentration at the inlet of a cyclone separator was discussed.
探讨了旋风分离器入口含尘浓度对其分离性能及粒级效率的影响机理。
3
The impermeable ability of EC capsule bodies was gradually enhanced with the increase of viscosity gradeof EC and concentration of EC solution.