引起儿童OSAHS常见的主要原因是()。
A.慢性鼻炎
B.鼻息肉
C.腺样体肥大
D.扁桃体肥大
E.肥胖
参考答案:C
You had better ______some time every day for sports so that you can keep yourself energetic.
A.set aside
B.take up
C.put away
D.give out
编写装配工艺文件不需要编写装配工艺过程卡。