当伤者牙关紧闭,无法进行口对口人工呼吸时,应()。
A、用工具把嘴撬开
B、加大压力口对口吹气
C、口对鼻吹气
参考答案:C
It's time ________ . [ ]
A. for school
B. to school
C. to go to school
D. A and C
CDS的计算机是()
A.CDU
B.PFD
C.ND
D.DEU