A:是否有丁达尔现象
B:是否能通过滤纸
C:分散质粒子的大小
D:是否均一、透明、稳定
He wants to make his invention more successful, so he it for many times.
刘叔叔带700元买化肥。买了16袋化肥,还剩下60元。每袋化肥的价钱是____元。