婴幼儿型青光眼（如图）首选术式是（）
A.房角切开术
B.小梁切开术
C.小梁切除术
D.非穿透小梁切除术
E.小梁激光切开术
参考答案：A, B
-Bad luck!I left my homework at home this moming.
-_____ [ ]
A. You should put away your things before you go to bed
B. You could be earlier
C. You should finish your homework on time
D. You should buy a new one
采用空气洁净度等级N1级至N5级的风管系统制作风管时，风管的咬缝不得采用( )咬口。
A．车
B．封闭式
C．开口式
D．按扣式
