单项选择题
A victim is coughing and wheezing from a partialobstruction of the airway. An observer should （）.
A.perform the Heimlich maneuver B.immediately start CPR C.give back blows and something to drink D.allow the person to continue coughing and dislodge the obstruction on his own
单项选择题 A victim has suffered a second-degree burn to a small area of the lower arm. What is the proper treatment for this injury?（）
单项选择题 A shipmate suffers a heart attack and stops breathing. You must（）.
单项选择题 A shipmate chokes suddenly，cannot speak，and starts to turn blue. You should（）.
