单项选择题
A.original course B.initial course C.final course D.designated course
Changing rescuers while carrying out artificial respira...
单项选择题Changing rescuers while carrying out artificial respiration should be done（）.
A.without losing the rhythm of respiration B.only with the help of two other people C.by not stopping the respiration for more than 5 minutes D.at ten-minute intervals
An uncontrolled flow of gas，oil，or other well fluids in...
单项选择题An uncontrolled flow of gas，oil，or other well fluids into the atmosphere is called a（）.
A.Flow B.Breakout C.Kick D.Blowout
All the traces are（）old ones.A.ClearB.EvidentC.ObviousD...
单项选择题All the traces are（）old ones.
A.Clear B.Evident C.Obvious D.Apparently
