开紫外线灯要注意什么

如何根据比重算需要怎么样调整外加剂?今天测的外加剂的比重是1.1,相对应的浓度是18,而实际上浓度应该是1实际上比重应该是1.06,我该怎么样调整配比呢? 外加剂中的的固体含量指什么? 保坍剂与葡钠有什么区别?能一起使用吗?保坍剂在外加剂中的含量是多少? Remember to spend some time( ) your loved ones,because they are not going to be around forever A fr Everyone后面加has还是have? it接have还是has'perhaps it has begun already.' 'it may have begun already'第二句为什么用的是have? Almost everyone has some kind of hobby:it may be something from collecting stemps to_____model planes.A.makeBmaking请问怎么选,为什么? everyone have a computers与everyone has a computers 有什么区别 We have almost enough juice for everyone 胃药里为什么含巴豆成分 never before 的疑问1.Never before has the city been in greater need of modern public transport than it is today.2.Never before has our country been as powerful as it is today.3.never before have so many people in the united states been out of work AS NEVER BEFORE翻译 实验小学今年五月份的用水量是276吨.五月份的用水量比四月份节约15%,节约用水多少吨? I like ( ) stories,but I do not like ( ) them now( 用read 的正确形式填空) I like to read some English stories.改为否定句 himself also like to read funny stories 这种表述是否正确? the books ____i like to read are about detective stories A:that B:which C:/ D:All the above 答案上说是选D 3V的小灯泡 接入220V直流电 这样肯定会烧掉 有什么电阻可以用吗 用什么型号的电阻3V的小灯泡 接入220V直流电 这样肯定会烧掉 有什么电阻可以用吗 用什么型号的电阻 it's fun to read english stories同义句 _____ english stories _____ fun I love you like i never ever loved no one before you怎么翻译 Never Knew Love Like This Before Jessie Ware 中英对译 最好一句对一句 英语翻译译中文 24V电源用3V蜂鸣器要串多大电阻? 远古生物都有什么?要海里的远古生物越古老越好 白光的直流电压为3V,串联10个就是30V,怎么将这30V变成24V,要串联多大的电阻? 作文介绍一种远古生物作文 300字！ 远古生物的介绍本人想写本关于远古时期历险的小说,请教下远古时期有哪些生物的名称和简单介绍. 送品液是由那些化学成分组成的 上次上个网看到有条鱼是人身的..有个熊比大象还大.见到青蛙有耳朵和牙齿..这种生物究竟是真还是假? 洗衣机水管接水龙头那口字该怎么接 诺基亚手机型号后面的字母C和S是什么意思?比如诺基亚6120c和诺基亚6120s 想请教以下这里的c. 做卤水豆腐对水有什么要求?自来水可以吗?