单项选择题
A.Apply ice-cold compress and renew every 4 hours
B.Commence artificial respiration immediately
C.Give enema
D.Pass catheter into bladder
单项选择题 After reporting a casualty to a mobile offshore drilling unit，which record must be retained on board? （）
单项选择题 After putting on a self-contained breathing apparatus，you open the air supply and hear a continuous ringing of a bell. What does this mean? （）
单项选择题 According to the Chemical Data Guide，epichlorohydrin is a(n)（）.