In this paper, we study the asymptotic behavior of the solutions of a new class of difference equations x_{n+1}=ax_{n-l}+bx_{n-k}+f(x_{n-l},x_{n-k}), where l and k are nonnegative integers, a and b are nonnegative real numbers, the initial values x_{-s},x_{-s+1...
一、系统构成 (1)正压式空气呼吸器具---2 (2)长管空气呼吸器---5 (3)正压式消防氧气呼吸器---5 (4)消防过滤式综合防毒面具---7 (5)空气呼吸器保障设备---