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赫晴类4851引起孩子铅中毒的原因都有哪些 -
蓝柴珠19169575683 ______ 可以说,目前城市人口从“衣、食、住、行”各方面均在不同程度遭受铅的危害. “衣”——含铅染料、化妆品、饰品直接接触;职业人员通过铅尘服装对家庭造成的污染,如交警、教师、金属冶炼、路边工作人员等; “食”——通过污染的...
赫晴类4851铅笔中并没有铅,为什么叫铅笔呢? -
蓝柴珠19169575683 ______[答案] 现在的铅笔并不含铅,而是用石墨和黏土制造的,之所以这样命名是由于其历史沿革造成的.古希腊、罗马曾用金属铅制成类似铅笔的铅棒.它们多为锥形,与其他物体磨擦后留下铅的痕迹,用来划线做标记.14世纪,欧洲出现类似现在的铅笔.1565年...
赫晴类4851一是两手来回搓笔二是用左手轻轻握住铅笔用右手握住铅笔的另一端转动那么哪个摩擦力小?为什么?答案20字以上一定要有原因的 顺便说明一下 分析谁是... -
蓝柴珠19169575683 ______[答案] 两种都是滚动摩擦,第一种摩擦力小.因为,手轻轻握住铅笔时时,手对整支笔的压力比第一种大,所以摩擦力也大.
赫晴类4851地球上的环境污染 -
蓝柴珠19169575683 ______[答案] 概述 环境污染(environment pollution): 人一直以为地球上的陆、空是无穷尽的,所以从不担心把千万吨废气送到天空去,又把数以亿吨计的垃圾倒进海洋.大家都认为世界这么大,这一点废物算什么?我们错了,其实地球虽大(半径6300多公里...
赫晴类4851汽车＂积炭＂是什么意思? -
蓝柴珠19169575683 ______[答案] 汽车工业日新月异的发展以及电子技术在汽车上的广泛应用,使汽车的燃油经济性、安全性、可靠性和舒适性都得到了显著... 会生成苯,对大气造成污染.通过以上分析,可以看出汽油中烯烃是积炭产生的主要原因,烯烃的含量直接影响着汽油的质量....
赫晴类4851儿童铅中毒的主要原因都是什么,孩子铅高应该注意什么 -
蓝柴珠19169575683 ______ 摄入铅过多所2113致.吃皮蛋,爆米花等多,或长时间接触汽车尾气等,就容易导致血铅高.多让5261孩子吃些驱铅的食物.比如:西红柿,橘子,紫菜等,再吃些含钙,锌4102多1653的食物,另外不要吃膨化食品和玩那些价格便宜又色彩鲜艳的塑料及回泡沫玩具.不要在马路边及污染答多的地方玩,相信孩子体内的铅慢慢会减少的!
赫晴类4851铅中毒是任何产生的铅是怎样危害身体的
蓝柴珠19169575683 ______ 职业性慢性铅中毒是由于接触铅烟或铅尘所致的以神经、消化、造血系统障碍为主的全身性疾病. 铅的热熔工艺只产生铅烟,不产生铅尘,用铅烟采样法测定;铅的冷工艺,只产生铅尘,不产生铅烟.
赫晴类4851吃什么会导致铅超标?孩子铅高怎么办? -
蓝柴珠19169575683 ______ 吃松花蛋,爆米花,油炸的含铅食品都会导致铅超标;孩子铅高首先要远离铅污染源,让孩子养成良好的生活卫生习惯,如勤洗手,减少在公路边的户外活动,不吞咬彩色玩具、铅笔,少接触油漆制品等;最重要的是可给孩子用益童旦讥测客爻九诧循超末成长力德希排铅口服液进行营养素排铅,尽快将血铅降到60ug/L以下更加安全.