R 15 0.541 0.118s 375 K K 375 0.184 ?? ??? N t N N T K I 1.327 203.3=270N m ? ???? LL t N T162 I 122.1A K 1.327 ? ??? N0 e N U 220 n 1583r/min K 0.139 ? ??? 0 s st st L n n I I I ?? 0 s st L stn 1583 n (I I ) (406.6 122.1) 1108r/min I 406.6 ? ????? m m m t / t / t / a L st L I (t) I (I I )e 122.1+(406.6-122.1)e 122.1 284.5 e ? ??? ??? ??? ?? m m t / t / s n(t) n (1 e ) 1108(1-e ) ? ?? ?? ?? m? m t 4 4 0.118 0.472s ?? ???