—What did your teacher say to you?

—He said _________.[ ]

A. I was good at math

B. what do I like

C. where do I live

D. how could I read it

岩煤芯采取必须作到（）

A.回次进尺不得超过岩芯管有效长度

B.不得使用弯曲钻具

C.使用合适卡料

D.提升钻具要稳