使用人工呼吸器,吸呼比应为
A.1:(0.5~1)B.1:(0.5~2)C.1:(1.0~3)D.1:(1.5~2)E.1:(1.5~2.5)
参考答案:D
简述刮板输送机组成?
When he realized the police had seen him, the man ____ the exit as quickly as possible.
A.made up
B.made for
C.made out
D.made off