1·Pollution problem of solid hazard waste from production of chromium salt refer two aspect: the one was old slag of donkey's years' store up, the another was keeping procreant fresh slag.
铬盐生产中固体危险废物污染问题主要涉及两个方面：一是多年积存的老渣，二是不断产生的新渣。
2·So, found out the reason that procreant the frustration in order to suit the remedy to the case will help to the student come...
因此，了解中小学生心理挫折产生的原因，对症下药的进行挫折教育，有助于中小学生的健康成长。