7月23日，海南海口，俯瞰海口新海港和南港“二线口岸”(货运)集中查验场。当日，记者从中国国务院新闻办公室发布会上获悉，经中共中央批准，海南自贸港定于今年12月18日正式启动全岛封关运作。封关是指，将海南岛全岛建成一个海关监管特殊区域，实施以“‘一线’放开、‘二线’管住、岛内自由”为基本特征的自由化便利化政策制度。（无人机照片）
【编辑：王祎】
###gaomengsuanjia：yizhongduogongnenghuaxuewuzhigaomengsuanjia（huaxueshi：KMnO₄）shiyizhongshenzisedehuaxuewuzhi，beiguangfanyingyongyuduogelingyu。tabujinzaishiyanshizhongbeihuaxuejiashiyong，yezainongye、shuichuliheyiyaodenglingyuzhanxianleqidutedejiazhi。shouxian，gaomengsuanjiazuiweirenzhideyongtuzhiyishiqiqiangyanghuaxing。zaishuichuliguochengzhong，gaomengsuanjianenggouyouxiaoquchushuizhongdetieliziheandan，tishengshuizhi。tanengtongguoyanghuafanyingfenjieshuizhongdeyoujiwuranwu，shishuitibiandegengjiaqingche。yinci，zaichengshigongshuihewushuichulideguochengzhong，gaomengsuanjiabanyanzhezhiguanzhongyaodejiaose。ciwai，gaomengsuanjiazainongyezhongyeyouzheguangfandeyingyong。nongminchangshiyongtazuoweiyizhongxiaoduji，yiyufangzhiwubinghaihekongzhiturangzhongdebingyuanjun。tongguoxishihoudegaomengsuanjiarongye，nongminkeyiyouxiaodichulizhongziheturang，quebaozuowudejiankangchengchang。zaiyiliaolingyu，gaomengsuanjiadezuoyongtongyangbukehushi。tajuyouyidingdeshajunnengli，changyongyupifuxiaoduhechuliyixiepifubing，birushizhenhezhenjunganran。nongdushizhongdegaomengsuanjiarongyekeyijianqingsaoyang，cujinshangkouyuhe，yinerchengweirichangshenghuozhongdeyizhongbianjieyixueyongpin。raner，shiyonggaomengsuanjiashiyexujinshen。gaonongdudegaomengsuanjiakenengduipifuhenianmozaochengciji，bixuanzhaozhidaojinxingcaozuo。ciwai，yinqiqiangyanghuaxing，jiechuyi#(#)#(#)#(#)高(gao)锰(meng)酸(suan)钾(jia)：(：)一(yi)种(zhong)多(duo)功(gong)能(neng)化(hua)学(xue)物(wu)质(zhi)高(gao)锰(meng)酸(suan)钾(jia)（(（)化(hua)学(xue)式(shi)：(：)K(K)M(M)n(n)O(O)₄(₄)）(）)是(shi)一(yi)种(zhong)深(shen)紫(zi)色(se)的(de)化(hua)学(xue)物(wu)质(zhi)，(，)被(bei)广(guang)泛(fan)应(ying)用(yong)于(yu)多(duo)个(ge)领(ling)域(yu)。(。)它(ta)不(bu)仅(jin)在(zai)实(shi)验(yan)室(shi)中(zhong)被(bei)化(hua)学(xue)家(jia)使(shi)用(yong)，(，)也(ye)在(zai)农(nong)业(ye)、(、)水(shui)处(chu)理(li)和(he)医(yi)药(yao)等(deng)领(ling)域(yu)展(zhan)现(xian)了(le)其(qi)独(du)特(te)的(de)价(jia)值(zhi)。(。)首(shou)先(xian)，(，)高(gao)锰(meng)酸(suan)钾(jia)最(zui)为(wei)人(ren)知(zhi)的(de)用(yong)途(tu)之(zhi)一(yi)是(shi)其(qi)强(qiang)氧(yang)化(hua)性(xing)。(。)在(zai)水(shui)处(chu)理(li)过(guo)程(cheng)中(zhong)，(，)高(gao)锰(meng)酸(suan)钾(jia)能(neng)够(gou)有(you)效(xiao)去(qu)除(chu)水(shui)中(zhong)的(de)铁(tie)离(li)子(zi)和(he)氨(an)氮(dan)，(，)提(ti)升(sheng)水(shui)质(zhi)。(。)它(ta)能(neng)通(tong)过(guo)氧(yang)化(hua)反(fan)应(ying)分(fen)解(jie)水(shui)中(zhong)的(de)有(you)机(ji)污(wu)染(ran)物(wu)，(，)使(shi)水(shui)体(ti)变(bian)得(de)更(geng)加(jia)清(qing)澈(che)。(。)因(yin)此(ci)，(，)在(zai)城(cheng)市(shi)供(gong)水(shui)和(he)污(wu)水(shui)处(chu)理(li)的(de)过(guo)程(cheng)中(zhong)，(，)高(gao)锰(meng)酸(suan)钾(jia)扮(ban)演(yan)着(zhe)至(zhi)关(guan)重(zhong)要(yao)的(de)角(jiao)色(se)。(。)此(ci)外(wai)，(，)高(gao)锰(meng)酸(suan)钾(jia)在(zai)农(nong)业(ye)中(zhong)也(ye)有(you)着(zhe)广(guang)泛(fan)的(de)应(ying)用(yong)。(。)农(nong)民(min)常(chang)使(shi)用(yong)它(ta)作(zuo)为(wei)一(yi)种(zhong)消(xiao)毒(du)剂(ji)，(，)以(yi)预(yu)防(fang)植(zhi)物(wu)病(bing)害(hai)和(he)控(kong)制(zhi)土(tu)壤(rang)中(zhong)的(de)病(bing)原(yuan)菌(jun)。(。)通(tong)过(guo)稀(xi)释(shi)后(hou)的(de)高(gao)锰(meng)酸(suan)钾(jia)溶(rong)液(ye)，(，)农(nong)民(min)可(ke)以(yi)有(you)效(xiao)地(di)处(chu)理(li)种(zhong)子(zi)和(he)土(tu)壤(rang)，(，)确(que)保(bao)作(zuo)物(wu)的(de)健(jian)康(kang)成(cheng)长(chang)。(。)在(zai)医(yi)疗(liao)领(ling)域(yu)，(，)高(gao)锰(meng)酸(suan)钾(jia)的(de)作(zuo)用(yong)同(tong)样(yang)不(bu)可(ke)忽(hu)视(shi)。(。)它(ta)具(ju)有(you)一(yi)定(ding)的(de)杀(sha)菌(jun)能(neng)力(li)，(，)常(chang)用(yong)于(yu)皮(pi)肤(fu)消(xiao)毒(du)和(he)处(chu)理(li)一(yi)些(xie)皮(pi)肤(fu)病(bing)，(，)比(bi)如(ru)湿(shi)疹(zhen)和(he)真(zhen)菌(jun)感(gan)染(ran)。(。)浓(nong)度(du)适(shi)中(zhong)的(de)高(gao)锰(meng)酸(suan)钾(jia)溶(rong)液(ye)可(ke)以(yi)减(jian)轻(qing)瘙(sao)痒(yang)，(，)促(cu)进(jin)伤(shang)口(kou)愈(yu)合(he)，(，)因(yin)而(er)成(cheng)为(wei)日(ri)常(chang)生(sheng)活(huo)中(zhong)的(de)一(yi)种(zhong)便(bian)捷(jie)医(yi)学(xue)用(yong)品(pin)。(。)然(ran)而(er)，(，)使(shi)用(yong)高(gao)锰(meng)酸(suan)钾(jia)时(shi)也(ye)需(xu)谨(jin)慎(shen)。(。)高(gao)浓(nong)度(du)的(de)高(gao)锰(meng)酸(suan)钾(jia)可(ke)能(neng)对(dui)皮(pi)肤(fu)和(he)黏(nian)膜(mo)造(zao)成(cheng)刺(ci)激(ji)，(，)必(bi)须(xu)按(an)照(zhao)指(zhi)导(dao)进(jin)行(xing)操(cao)作(zuo)。(。)此(ci)外(wai)，(，)因(yin)其(qi)强(qiang)氧(yang)化(hua)性(xing)，(，)接(jie)触(chu)易(yi)
