A：制氯化铁：2Fe+3CuCl2═2FeCl3+3Cu
B：用稀硫酸除去炭粉中的少量氧化铜：CuO+H2SO4═CuSO4+H2O
C：用硝酸钡区别氢氧化钠和硫酸钾：K2SO4+Ba（NO3）2═BaSO4↓+2KNO3
D：用氢氧化铝治疗胃酸过多症：Al（OH）3+3HCl═AlCl3+3H2O
I don't have much time for breakfast, so I usually eat very ____ (quick).
300–150 =____ 300+105 =____ 80+120=____
315–200=____ 800–600 =____ 205+50 =____
5×2+24 =____ 16÷4+20 =____ 35 + 15-40 =____
