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theanhnguyen29112000
2 năm trước
a, Để trung hòa đủ 200ml dung dịch KOH 0,4M cần m gam $CH_{3}$COOH. Tính m b, Cho m gam $CH_{3}$COOH trên tác dụng với một dư lượng rượu etylic Tính khối lượng este sinh ra nếu hiệu suất phản ứng là 70%
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Yesterday,when I was riding along a busy street,I saw an accident.A woman was knocked down when she crossed the street at a zebra crossing.Many people stopped to offer their help.A policeman arrived and asked a young man to telephone for an ambulance.While waiting for the ambulance,the policeman and some people tried to stop the bleeding.They used a handkerchief to cover the wound,then put pressure on it and held it tight.They tried to talk to her in order to keep her awake.After about ten minutes,the ambulance arrived and the woman was taken to the hospital. True or False 1.The accident happended when A woman crossed the street at a zebra crossing 2.The policeman and some people tried to stop bleeding. While waiting for the ambulance 3.They used a towel to cover the wound 4.After about ten mintutes. the ambulance arrived

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