用的最多的还是非离子型和阴离子型的、分子量在5×105，10×106之间的聚丙烯酰胺。
参考答案：对
五边形的内角和是（ ）
A．180°
B．360°
C．540°
D．600°
The novels written by MoYan ______ magic and mystery.
A．is full of
B．are full of
C．is full with
D．are full with
