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分多次用等量清水去冲洗一件衣服,每次均可冲洗掉上次所残留污垢的34,则至少需要多少次才可使得最终残留的污垢不超过初始污垢的1%?(8分)
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皮肤受到氨的损伤后应用大量清水冲洗10分钟以上接着可用或冲洗最后再一次用清水洗净受伤部位
现分多次用等量清水去冲洗一件衣服每次均可冲洗掉上次所残留污垢的则至少需要冲洗几次才可使得最终残留的污
3次
4次
5次
6次
清洗风挡和侧窗玻璃外表面时首先用.
充足的清水冲洗掉灰尘和污垢
软布或海面蘸中性肥皂水洗刷
干净鹿皮或脱脂棉擦净玻璃表面
浸湿的干净软布轻擦除掉表面灰尘
人身着火扑灭后应立即用清水冲洗掉烧伤皮肤上的灰土
强酸或碱等化学灼伤应立即用大量清水彻底冲洗迅速将被侵蚀的衣物剪去为防止酸碱残留在伤口内冲洗时一般不少
日常生活中我们要科学地节约用水现有一件刚用洗涤剂洗过的衣服拧干后湿衣服上残留的溶液为100g其中含洗
王先生用清洗剂擦拭抽油烟机已知每次可擦掉上次残留污垢的那么至少需要重复擦拭次才能使最终残留的污垢不
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日常生活中我们要科学地节约用水.现有一件刚用洗涤剂洗过的衣服拧干后湿衣服上残的溶液为100g其中含洗
强酸或碱等化学灼伤应立即用大量清水彻底冲洗迅速将被侵蚀的衣物剪去为防止酸碱残留在伤口内冲洗时一般不少
现分多次用等量清水去冲洗一件衣服每次均可冲洗掉上次所残留污垢的则至少需要冲洗几次才可使得最终残留的
3次
4次
5次
6次
某品牌冰红茶配料表纯净水白砂糖精制盐焦糖色柠檬酸红茶粉柠檬酸钠食用香精1冰红茶中的溶质有种2有些厂商
日常生活中我们要科学地节约用水现有一件刚用洗涤剂洗过的衣服拧干后湿衣服残留的溶液为100g其中含洗涤
彻底清洗平地机确保把所有残留物冲洗掉
日常生活中我们要科学地节约用水现有一件刚用洗涤剂洗过的衣拧干后湿衣服上残留的溶液为l00g其中含洗涤
小明的衣服上沾有一些油渍用水很难洗净放一定量的洗衣粉后搓揉再用水冲洗油渍便洗掉了下列说法正确的是
洗衣粉是乳化剂
冲洗衣服得到液体是溶液
油能溶于热水中,只用热水也可洗掉油渍
衣服上的任何污渍都可用洗衣粉洗净
化学烧伤后正确治疗方法有
被酸、碱浸湿之衣服应立即脱去
皮肤烧伤用大量清水冲洗
必须使用中和剂
眼化学烧伤不用清水冲洗
干石灰烧伤应先快速除去石灰粉粒再用冲洗
操作人员皮肤被硫酸灼伤后处理方法不正确的是
立即用大量的清水冲洗
用5%的碳酸氢钠洗涤
用毛巾或棉纱擦去皮肤上硫酸
冲洗灼伤处的同时冲洗被酸污染的衣服
苯酚灼伤正确的急救处理是??
先用大量清水冲洗,继以30%~50%乙醇擦洗,再以饱和硫酸钠溶液湿敷
立即用5%碳酸氢钠溶液冲洗后再用清水冲洗
用1%~5%氯化钠溶液冲洗
用清水冲洗10~20分钟即可
用饱和的氢氧化钙溶液冲洗
分多次用等量清水冲洗一件衣服每次均可冲洗掉上次所残留污垢的3/4问至少需要多少次才可使得最终残留的污
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水冲洗目的是用大量的水洗掉系统中的灰尘泥沙和脱落的藻类及腐蚀物等的污垢为前期的清洗创造好的条件
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Passage2 Newspapersarenotonlyaspopulartodayastheywereinthepast.Therearenotmanypeoplewhoseriouslyreadanewspapereveryday.Mostpeoplereadonlythesportspagestheadviceorgossipcolumnsthecomicsandperhapstheclassifiedadvertisements.Mostpeopledonttakethetimetoreadtherealnews.Newspapereditorssaythattheirreadersarelazy.Theysaytheyhavetotrickpeopleintoreadingthenews.Theyattempttocatchthereadersinterestwithpicturesandexcitingheadlines.Thesetechniquesareusedonthefrontpagebecauseitisthefirstthingyouseewhenyoupickupthepaper.Thefirstpageattractsattentionandencouragesthereadertolookthroughtherestofthepaper.Thisiswhyeditorsalwayslookforagoodfirstpagestoryandheadlinesthatmakeyoustopandlook.Iftheheadlineishorribleenoughorfrighteningenoughorwildenoughperhapsyouwillgoontoreadtherestofthestory.Justthesametherearealotofpeoplewhodonotevenreadthefrontpageanymore.Theymayreadtheheadlinesbutthatisall.Thentheyturntothesportspageorcomicsoradvertisements.Itseemsthatpeopledonotwantthenewsfromanewspaperanymore.Theysaytheygetthenewsonthetelevisionnow. Morepeoplewatchtelevisionnewsbecauseitiseasierandmoreinterestingthanreadinganewspaper.WhataboutyouDoyoureadnewsfromanewspaperDoyouwatchthenewsontelevisionDoyouthinkiteasiertogetthenewsfromtelevisionDoyoulistentotheradioordoyouevencareaboutnewsatallWouldyoumindiftherewerenonews Todaymorepeoplegetnewsfrom.
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