A:M的溶解度比N大
B:t1℃时,M接近饱和的溶液降低温度可以达到饱和
C:t2℃时,100g N的饱和溶液中溶解了30g N物质
D:t2℃时,M,N溶液的溶质质量分数相等
-- Where's Mr Yu, do you know?
-- Well, it's hard to say. But I heard him loudly here just now.
地球七大洲的总面积约是149 480 000km2,对这一数据精确到10000000可表示为( )