重亚硫酸盐

Add 100-150g of finely crushed ice and stir until the m-nitroaniline has been converted into the sulphate and a homogeneous paste results. Cool to 0-5°C by immersion of the beaker in a freezing mixture, stir mechanically and add a cold solution of 18g(0.26mol) of sodium nitrite in 40 ml of water over a period of 10 minutes until a permanent colour is immediately given to potassium iodide-starch paper: do not allow the temperature to rise above 5-7°C during the diazotisation.

加入100-150g碎冰，搅拌至m-硝基苯胺成硫酸盐，把烧杯浸入到冷冻液中冷却到0-5°C，机械搅拌下于 10 min内加亚硝酸钠冷溶液（由18g(0.26mol)亚硝酸钠和40 ml 水组成），直到用淀粉-碘化钾试纸测试时，能使该试纸立即显色且不褪色：在重氮化反应时不允许温度超过5-7°C。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。