1. [单选题]下列关于污染伤口，一般认为伤后______以内处理者属于此类伤口。
A. 8小时
B. 12小时
C. 24小时
D. 48小时
2. [单选题]在划桨时各桨手一定要向哪个桨手看齐?
A. 指挥者
B. 身边桨手
C. 领桨手
3. [单选题]关于空压机总效率的以下说法正确的是( )。Ⅰ.小型机一般比大型机高;Ⅱ.大型机一般比小型机高;Ⅲ.水冷机一般比风冷机高;Ⅳ.风冷机一般比水冷机高。
A. Ⅰ+Ⅲ
B. Ⅱ+Ⅳ
C. Ⅲ+Ⅳ
D. Ⅱ+Ⅲ
4. [单选题]Which of the processes listed would be the most satisfactory method to use to lower the humidity of the air being circulated by an air conditioning system?
A. Cooling the air to a temperature just above dew point
B. Heating the air to a point at which moisture will boil off ,then re-cooling it
C. Cooling the air to a point below dew point, then reheating it
D. Heating the air and then cooling it to a point below dew point
5. [单选题]胸外按压时应使胸骨下陷______。
A. 2—3厘米
B. 4—5厘米
C. 1—2厘米
D. 5厘米以上
