【单选题】He was busy to help me at the moment.
【简答题】What’s your understanding of the value of an English abstract?
【单选题】Your value is not what you possess, but what you ______.
【简答题】里奇说:“一条个人的需求曲线可以从一个无差异曲线图和一组预算线中推导出来。你所要做的就是改变一下收入水平,并观察最优市场组合是如何发生变化的。”你同意他的观点吗?
【单选题】He was___ help me at the moment.
【判断题】量化级数越多,编码位数越高,信噪比越大,所需信号带宽越宽。