--- Can you tell me how many study groups there are in a class?              

--- Generally speaking, a class often ___ 8 study groups, each with 7 group members.

A．is consisted of

B．is made of

C．made up of

D．consists of

当岩电吻合时进行岩心归位（收获率不大于100％），下列说法中不正确的是（）。

A.依据岩心录井草图进行岩心归位

B.根据标志层进行岩心归位

C.根据自然电位曲线半幅点划分岩层顶、底界

D.岩心归位不得超出本筒顶、底界