【单选题】以下哪项属于长期稳定的转移性收入( )?
【单选题】There _______ a lot of _______ on the roads yesterday.
【单选题】设函数f(x)在(0,+∞)内具有二阶导数,且f(x)>0,令un=f(n)(n=1,2,…),则下列结论正确的是
【简答题】The narrow roads were______(crowd) with holiday traffic.
【单选题】设函数f(x)在(0,+∞)内具有二阶导数,且 ,令 ,则下列说法正确的是( )
【简答题】设函数u=u(x,y)的全微分du=[e x +f'(x)]ydx+f'(x)dy,其 中f在(-∞,+∞)内具有二阶连续的导数,且f(0)=4,f'(0)=3,求f(x)及u(x,y)
【简答题】针对剧烈呕吐和腹泻的病人的病情观察,下列哪项指标对有无失水及严重程度的判断无关