玩得开心英语

衣服的染料怎么区分是植物染料还是化学染料我听说衣服颜料有植物染料和化学染料,那怎么区分衣服用的染料是化学的还是植物的啊,麻烦说的简单易懂就行呵呵谢谢了啊 英语翻译sodium laureth sulphate - fatty alcohols C12-C14 ethoxylated 7EO - cocamide dea - coco amido propyl betaine - lauramine oxide - cetrimonium chloride - sodium alkane sulphonate - hepa sodium salt of diethylenetriamine pentamethylene phosph 重水是什么?具体有什么用途?如题. D2O在利用1H-NMR进行化合物的结构鉴定中,有什么特别的用处吗? 鉴别H3BO3和硼砂的最简单方法?这是个填空题； 硼酸和硼砂有什么区别吗, 请问Ca(OH)2+SO2=CaSO3↓+H2O Ca(OH)2+SO3=CaSO4+H2O为什么前面是生成2个氧的而后面是3个氧的? SO2+CA(OH)2反应,当so2过量时,为什么生成的是ca(hso3)2,而不是caso4+h2o?如何分析so2过量的问题？ Ca(OH)2+SO2→CaSO4+H2O 咋配平 少儿书信大赛怎么写 第七届青少年儿童书信文化比赛怎么写啊 第四届青少年儿童书信文化比赛要求,内容,等 第七届青少年儿童书信文化比赛怎么写/ 废电池的回收与利用,谁知道? 第六届全国少年儿童书信怎么写 CaSO3和CaSO4哪个是沉淀 哪里有卖雪花制冰机的? 雪花制冰机维修；北京雪花制冰机售后电话 雪花制冰机维修,雪花制冰机统一售后电话? 什么物质燃烧生成CO2和H2O 给些龙岩市第七届少年儿童书信文化活动的作文 第五届江苏省少年儿童书信文化活动可写的有家乡名人、优秀党员、英雄模范、时代先锋等.要具体人物和贡献我只要人和事迹，不要现成的文章... 为什么做沙琪玛要用硼砂 Last summer I went to Lu Xun's hometown and visited the house( ) he was born.A.that B.there C.whic CaO SO2加热生成CaSO4?请写一下方程式 Where did you go last week?——I went to Zhang Aiping 's hometown and visited the house__ he was born in?A.thatB.whereC.whoD.whose答案为什么是A呢? last summer i went to chairman mao s hometown and visted the house （ ）he was bomA that B there C which D where I went to Zhang Aiping 's hometown and visited the house ___ he was born in .,我想问填where行不行,为什么,请详解, last summer holiday,I went back to my hometown,_______ the neighbours and the houselast summer holiday,I went back to my hometown,_______ the neighbours and the house ______ I used to be familiar with were gone.A only to find; that B found ;that为 求点运动会上的加油词,越多越经典越好!明天就运动会了,帮忙想电加油词.短小的,不要长篇大论 I went to the KFC and ate good food last week.有没有语病? susan went to london last month 用next month替换last month