隧道施工常用爆破方法，根据炮眼的位置、作用的不同，炮眼分为( )。
A．周边眼
B．单独眼
C．掏槽眼
D．辅助眼
E．三角眼
参考答案：A,C,D
出于商业秘密的考虑，基金管理人、代销机构对机构投资者适用优惠费率，可以不进行公告。（）
We _________ the work on time without your help. [ ]
A. hadn't had finished
B. didn't have finished
C. couldn't have finished
D. can't have finished
