决策支持系统与管理信息系统相比存在四个基本的特点。
参考答案：对
—Did the radio say ________?
—Yes, from Hunan.
A．how the bad rice came
B．where the bad rice came from
C．how did the bad rice come
D．where did the bad rice come from
管径小于2mm的气道阻力占总阻力的
A．10%B．15%C．20%D．25%E．30%
