The addition problem above shows four of the 24 different integers that can be formed by using each of the digits 1, 2, 3 and 4 exactly once in each integer. What is the sum of these 24 integers ？（）

对于汽油机，只要急加速装置向喉管喷油，发动机气缸压力足够，点火系正常，发动机足能起动。