选择题：在c#中using和new这两个关键字有什么意义,请写出你所知道的意义?using 指令 和语句 new 创建

彩电销售商之间的联合限制竞争行为属于( )A.联合抵制B.纵向联合限制竞争行为 C.横向

共用题干 第三篇Sleepless at NightIt was a normal summer night.Humidity（湿气）hung in the thick air.I couldn't go to sleep,partly because of my cold and partly because of my expectations for the next day.My mum had said that tomorrow was going to be a surprise.Swea

需要实现对一个字符串的处理,首先将该字符串首尾的空格去掉,如果字符串中间还有连续空格的话,

判断一种生产关系是否先进的根本标志在于它是( )A.促进生产力发展还是阻碍生产力发展

共用题干 Narrow EscapeWe had left the hut too late that morning.When we stepped outside,the sky beyond the mountains to our east was already livid with colour.It meant the day would be a hot one,and the warmth would loosen rocks that were gripped by ice.As s