【单选题】微分方程xy′-ylny=0的满足y(1)=e的特解是()。
【判断题】生制培根 水分 要求小于等于 70.0 g/100g。
【单选题】已知z=3cos(cos(xy)),则x=0,y=0时的全微分dz=()
【单选题】在Word中,在页面设置选项中,系统默认的纸张大小是以下哪一项
【简答题】Sports can help us a lot. Taking exercise can make us strong. In collective集体的sports like basketball,volleyball or football,wewill learn the importance of cooperation合作. And sports can also help us re...
【多选题】以下关于边际效用理论的说法,正确的有( )。
B.
从数学的意义上看,边际效用就是总效用函数的斜率
【单选题】It has been proved taking exercise regularly does good to one’s health.