自然伽马测井仪器是测量地层中（）的总强度。
A、自然伽马射线
B、岩性
C、铀
D、钍
参考答案：A
Some children want to challenge themselves by learning a language different from __________their
parents speak at home.[ ]
A. what
B. that
C. which
D. one
集中机中，当磁石盘有故障时，可用（）分盘应急代替。
A.共总
B.共分
C.组呼
D.选号
