吸氧浓度为33%,每分钟氧流量为()。
A.1L
B.2L
C.3L
D.4L
E.5L
参考答案:C
解析:[考点] 氧气成分、浓度、氧浓度和氧流量的换算法[重点等级] ★★★★
— Is there any room in the ship?
— Yes. We can probably ____ a few more people into it. [ ]
A. press
B. squeeze
C. hold
D. push
教好一堂课的前提是()
A.备好课
B.充分了解学生
C.认真钻研教材
D.设计好教学方法