a:CPAP(cotinuous positive airwpressure)
b:HFOV(high frequenoscillatory ventilation)
c:PCV(pressure control ventilation)
d:PSV (pressure support ventilation)
e:SIMV(syncchronous intermittent mandatory ventilation)
1. a b c 2. a b e 3. a d e 4. b c d 5. c d e