题目

Bike﹣sharing has swept across China, with an increasing（增长的） number of people choosing bike riding instead of driving．The bike has GPS or Bluetooth on it, and those bikes can be easily unlocked（解锁） with a smart phone and left any where in public．Bike﹣sharing allows people to borrow a bike from one place and return it at another place easily．In some cities, we can see more and more people riding this kind of sharing﹣bikes．It’s very convenient to use the bikes if you have a smart phone．First, you have to download(下载) such an APP on your smart phone．Then 现有下列实验步骤可供选用(有些步骤可重复使用)： ①加入稀HNO3溶液 ②加入稀H2SO4溶液 ③加入稀HCl溶液 ④加入AgNO3溶液 ⑤加入MnO2 ⑥加水溶解 ⑦加热 ⑧取少量溶液 ⑨再另取少量溶液 ⑩过滤后取滤液 写出下列实验的正确操作顺序(用序号排列)． (1)证明一种白色固体粉末是BaCl2的实验：________． (2)证明KClO3中含有氯元素的实验：________．