治疗阻塞性睡眠呼吸暂停低通气综合征OSAHS,最常用的手术方式应为()
A.鼻息肉摘除术
B.鼻中隔矫正术
C.扁桃体切除术
D.腭垂腭咽成形术
E.气管切开术
参考答案:D
先化简,再求值:(x+1)2-(x2-1),其中x=-2。
It was now clear that no such weapons were manufactured and none been found.
A.was found
B.were founded
C.has been found
D.have been founded