直眼掏槽的优点之一是炮眼深度不受巷道断面的限制。
参考答案：错
The restaurant is nice and the food is not bad, I still prefer eating at home. [ ]
A. and
B. but
C. so
D. or
GTP隧道协议是用在以下哪个接口上？（）
A.Gn
B.Gp
C.Iu
D.Ga
