可作为肿瘤标志物的指标有()
A.CEA
B.AFP
C.γ球蛋白
D.HBsAg
E.PT
参考答案:A, B
---Let’s go to the park after school.
--- _______________.
A.I’m OK.
B.Thank you.
C.Bye.
D.Good idea.
《煤矿防治水规定》在探放水钻进时,发现哪些情况时应当立即停止钻进,但不得拔出钻杆?