悬浮法生产PVC时，由于采用分散剂种类不同产品有（）和（）之分。
参考答案：疏松型；紧密型
Mis Smith is a friens of ___.
A．Mary’s mother’s
B．Mary’s mother
C．Marys’ mother
D．Mother’s of Mary
The audience were ______ by his ______ performance on the stage. [ ]
A. amused; amused
B. amused; amusing
C. amusing; amused
D. amusing, amusing
