1 是 ph试纸是由化学试剂做的
2 白炽灯不是,只是电能转化为化学能
1 是 ph试纸是由化学试剂做的
2 白炽灯不是,只是电能转化为化学能
最新问答: 蜚蠊这两字怎么读 数学几何等腰梯形已知梯形两腰长分别为3和4,上底长为2,则下底X的取值范围是_________. 解不等式 (2a-3 )x+a+1>0的解集是x 一般现在时被动语态结构和一般过去时被动语态? Mobile phones are everywhere. itseems that no one can _ with 如何看陌生单词读得正确,如何看单词写音标. 谁能帮我解这道简单的方程,2的X次方等于4,这道方程怎么解,我知道X=4, w,zh,ye,ui,er,ch,u,chi,ie,yuan,da,ying,t,ji,zhi,y,声母有:()韵母:( I like autumn,I can watch the leaves f_____ 1+1一加一到底等于几呀好 孝敬父母,体验亲情为主题的作文怎么写啊? 改错:Ann is taking well care of her pet dog.I asked him for hi —Do you have any pl 为什么我买的LED发光二极管两边都导通的? 高中化学有什么号的辅导书?最好有典型例题,讲解和练习都多一些的. From what number can you take away half and have nothing lef Those ___interested in the subject___welcome to the lecture. 解方程:[0.1x−0.02/0.002]-[0.1x+0.1/0.05]=3. 如图,已知抛物线y=-x^2+bx+3与x轴交于A,B两点,与y轴交与点C,并且OA=OC (1)求这条抛物线的解析式 【紧急】求csdygfx解答