将下列各组内的物质混合,如果各组中的最后一种物质均过量,充分反应后过滤,则滤纸上只留下一种不溶物(纯净物)的是( )
A:Zn、Ag、CuSO4溶液(过量)
B:K2CO3溶液、BaCl2、硝酸(过量)
C:Na2SO4溶液、BaCl2溶液、盐酸(过量)
D:BaCl2溶液、AgNO3溶液、稀硫酸(过量)
①从实际出发,不要掺杂个人的感情成分
②认识到事物运动的绝对性和静止的相对性
③要把控事物量变程度,做到动静相宜
④自觉运用规律性认识指导艺术创作
Hello! My name’s John. I’m in Beijing now. It’s hot in Beijing. It’s sunny too.
I can wear my shorts and shirt. My shorts are green. I have a new jacket. My old jacket is too small. I want to buy a hat.The hat is very pretty, but it is $60. that’s very expensive.
The shorts are yellow.