对同一钻井液而言，其（）愈大，滤饼愈厚。
A、滤失量
B、质量
C、密度
D、体积
参考答案：A
找出错误并改正。
( ) 1. What would you like have for lunch?
A B C D
( ) 2. What your favourite food?
( ) 3. What do you have on lunch on Mondays?
( ) 4. Bananas is my favourite fruit.
( ) 5. It's time for go to bed.
正态曲线下、横轴上，从均数-1.96倍标准差到均数的面积为（）。
A.95%
B.45%
C.97.5%
D.47.5%
E.49.5%
