harmful impurity of acetylene 乙炔有害杂质
harmful impurity element 有害杂质元素
harmful impurity of acetyle 乙炔有害杂质
Alunite is a harmful impurity which is difficult to remove from kaolinite and so is kaolinite in alunite ore.
明矾石是高岭土中难以除去的有害杂质，高岭石也是明矾石矿石中的有害杂质。
Alunite is a harmful impurity which is difficult to remove from kaolinite, and so is kaolinite in alunite ore.
明矾石是高岭土中难以除去的有害杂质，高岭石也是明矾石矿石中的有害杂质。
The paper relates the pollution and harm from the drained off waste acid from wire drawing and cooling water with harmful impurity in steel wire production.
叙述拉丝生产中排放的废酸和含有害杂质的冷却水对周围水质的污染及危害。
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