单项选择题
The principal personnel hazard unique to Halon extinguishers is（）.
A.displacement of oxygen B.skin irritation C.inhaling toxic vapors D.eye irritation
单项选择题 The most effective warming treatment for a crew member suffering from hypothermia is（）.
单项选择题 The danger associated with using carbon dioxide in an enclosed space is（）.
单项选择题 The Agreement sha1l commence（）a satisfactory Medical Report by a doctor nominated by the Company.
