向原油中加入阳离子型的表面活性剂,使其与阳离子型的乳化剂结合,达到破乳的目的,这属于破乳剂的()作用。
A.正吸附
B.反相破乳
C.反离子
D.润湿、渗透
参考答案:C
.
These articles________the problems of the modem world, including race relations and community development.
A.address
B.avoid
C.create
D.correct
四条直线两两相交,至多会有______个交点.