基本解释表面粗糙度同根派生 英汉例句Experimental results indicate that powder-mixed EDM can provide both higher MRR and lower surface roughnes... 结果表明,在加工能量较小的情况下,混粉电火花加工与普通电火花加工相比,兼备加工效率高和加工质量好的优点;