阻塞性睡眠呼吸暂停低通气综合征(OSAHS)一般是指成人7小时的夜间睡眠时间内,至少有多少次呼吸暂停()
A.10次
B.20次
C.30次
D.40次
E.50次
参考答案:C
--I just wonder ______ that made Mo Yan so famous a writer.
--Of course his early experiences in his hometown.
A.it was what
B.what he did
C.how he did
D.what it was
人体内产生自然对比最明显的部位是()
A.胸部
B.腹部
C.躯干
D.四肢
E.头部