A. 注意无菌操作 B. 每日更换引流袋 C. 保证通畅,定时冲洗 D. 观察记录引流量及性质 E. 注意观察病人的食欲及粪便颜色变化
A. more power strokes per revolution B. the use of scavenge air C. more complicated valve gear D. higher working temperature of the piston and cylinder
A. 正确 B. 错误