Decoloration of acidic scarlet GR by pyrolusite is studied in this paper. The effects of pH in solution, dosage and granularity of pyrolusite, reaction temperat
二十二、天气 1.What’s the weather like today?今天天气怎样? 2.How’s the weather in…?……的天气怎样? 3.It’s fine/cloudy/windy/rainy/snowy……今天天晴(天阴、有风、雨天、下雪)…… 4.It’s getting cold/warm……天气转冷(暖和)…… 5.It’s a beautiful d