(14分)下图为中学化学中几种常见物质的转化关系(部分产物已略去)。已知:A、C、D是常见的气体单质,F气体极易溶于水,且液态常做制冷剂。(1)写出化学式A ,D ,G ,写出电子式F ;(2)鉴定G中阳离子的实验方法和现象:_________________________________ .______is a fact that English is being
accepted as an international language.
A.There
B.This
C.That
D.It