对水敏性地层，含一定量K﹢的钻井液有利于防塌。
参考答案：对
So convenient ______ to pay by credit card that more and more people apply for their credit cards. [ ]
A. do people find
B. people find it
C. find people
D. do people find it
各种肝炎病毒的共性是（）
A.传播途径
B.复制机制
C.嗜肝性
D.临床预后
E.治疗措施
