运输基础设施的特点主要有()、()、()、()和()。
参考答案:社会公益性,价值,使用价值,级差效益,商品属性
湿腐与软腐的区别是什么?
I often tell people that have failed in some business that what you lose on the ______ you get back on the roundabouts.
A. swings B. sprays C. ends D. logs