口对口吹气法人工呼吸每分钟约吹()次。
A、14—16
B、10—12
C、17—20
参考答案:A
Economic growth in the world remains weak throughout 2013 and it is hoped that it will
gradually in 2014.
A.break up
B.make out
C.work out
D.pick up
热电阻由()组成
A.热电阻体
B.绝缘套管
C.保护套管
D.接线盒
E.引线