泡泡糖有一种特别的味道,这种味道来自于什么?
参考答案:这种味道来自于橡皮
– What do you know about _______?
-- Line drawings that show how something works.
A.pictures
B.diagrams
C.programmes
D.paintings
气管内一次吸痰时间应限制在()
A.2秒以内
B.5秒以内
C.10秒以内
D.20秒以内
E.30秒以内