光面爆破打的好的巷道不易被压坏。这句话对吗？
参考答案：这句话对。因为围岩不产生炮震裂缝，保持了围岩的完整性，从而增强了围岩的自身承载能力。
The young lady stopped and looked around as if_____ whether she was being followed.
A seeing B to have seen C having seen D to see
雷尼替丁的结构为（）.
A．氟他胺
B．非那雄胺
C．左炔诺孕酮
D．丙酸睾酮
E．达那唑
