常見例句雙語例句Nuclear pure natural flake graphite has been obtained by chemical purification process.用化學(xué)提純工藝制出了核純天然石墨粉；Answer: want first choice, remaking sand, through the magnetic separation, flotation or chemical purification, silica be 95 percent.答：先要精選，再制砂後，經(jīng)磁選、浮選或化學(xué)提純後，二氧化矽能達到95%。The investment and purification cost of chemical purification method is considered lower in producing feed grade, industrial grade, food grade phosphate by using WPA;認爲(wèi)，用溼法磷酸制飼料級、工業(yè)級和食品級磷酸鹽産品，採用新化學(xué)淨(jìng)化溼法磷酸投資少，淨(jìng)化成本低； 返回 chemical purification