题型:判断题 The train ______ she was traveling was late. [ ]A. on thatB. for which C. on which D. which 查看答案
题型:判断题 下面是几种常见的转化关系图(假设各反应均完全).请回答下列问题:(1)物质A是______,物质B在反应中①的作用是______(2)实验室检验气体D 的方法是______.(3)请写出反应④的化学方程式______. 查看答案