聚丙烯酰胺(PAM)常作为不分散低固相钻井液的()剂。
A、絮凝
B、降滤失
C、稀释
D、乳化
参考答案:A
There is going to _____ a sports meeting in our school next week.
A.have
B.hold
C.be
D.do
阳偏衰病变以______二脏为多见,尤其是_______。