出国留学网专题频道硫酸盐栏目，提供与硫酸盐相关的所有资讯，希望我们所做的能让您感到满意！ 硫酸盐，是由硫酸根离子（SO4）与其他金属离子组成的化合物，都是电解质，且大多数溶于水。硫酸盐矿物是金属元素阳离子（包括铵根）和硫酸根相化合而成的盐类。由于硫是一种变价元素，在自然界它可以呈不同的价态形成不同的矿物。当它以最高的价态S6+与四个O2-结合成SO42-，再与金属元素阳离子即形成硫酸盐。在硫酸盐矿物中，与硫酸根化合的金属阳离子有二十余种。就是说有含硫酸根的盐就是硫酸盐。硫酸盐经常存在于饮用水中，其主要来源是地层矿物质的硫酸盐，在大量摄入硫酸盐后出现的最主要生理反映是腹泻、脱水和胃肠道紊乱。2016年12月，中德两国研究人员揭示北京雾霾中硫酸盐生成机制，建议加大氮氧化物减排。
《高中英语语法-高一年英语阅读理解练习（七）》由出国留学编辑精心为您学习英语准备.liuxue86.com。本内容整理时间为05月12日，如有任何问题请联系我们。
高一年英语阅读理解练习（七）
A
"Mummy, I don' t know what to play with." Steve interrupts his mother, who is talking to a friend, for the fourth time. "You've got a room full of toys!" his mother says, impatiently. In fact it is the jumble of toys which is to blame for four-year-old Steve's lack of interest in his dolls, cars and stuffed (packed) animals. Each morning he tips out three washing baskets of toys all over his floor, listlessly pulls out something and shortly after is standing at his mother's desk or following her into the kitchen saying: "Mummy, I am bored."
A family therapist (心理医生) explains why children lose interest when they have a whole "toy shop" at home: "According to their brain development, little children are not in a position to judge the quality of a variety of things at once. There is always just one favorite toy for the moment. All the rest is left lying about." What can parents do to stop their children from being oversupplied with toys? Under no conditions simply make something disappear without the child's knowledge. If he/she takes no more notice of a toy, a parent can ask if it can be stored or given away. Be warned though the child will always say he/she wants it then! A talk with relatives and friends may also help. Lyn is the mother of four-year-old Jessie, and we like her way. A small set of shelves in her child's room holds the toys and book...
硫酸盐推荐访问
