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。
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。
The air of close cabin can't exchange with that of atmosphere, the harmful impurity must be wiped off from cabin, in which the purity and element of gas needed can be maintained.
封闭舱室不能与大气中的空气进行交换，必须去除舱室中有害杂质，维持必需的气体成分和纯净度，需要一套有效的空气调节和再生装置来完成这一任务。
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