【简答题】已知函数f(x)=ax-lnx, g(x)= lnx x ,它们的定义域都是(0,e],其中e≈2.718,a∈R ( I)当a=1时,求函数f(x)的单调区间; ( II)当a=1时,对任意x 1 ,x 2 ∈(0,e],求证: f( x 1 )>g( x 2 )+ 17 27 ( III)令h(x)=f(x)-g(x)?x,问是否存在实数a使得h(x)的最小值是3,如果存在,求出a的值;如果不...
【简答题】The aggressive young man can go far in this firm.
【单选题】燃油泵进口处的燃油滤网被污染,以下做法正确的是 ( )
A.
清洁燃油箱及燃油滤网,然后对燃油系统做进一步检查
B.
把燃油泵进口处清理干净,再装上燃油泵就可以继续使用
【单选题】燃油泵进口的燃油漉网被污染,以下做法正确的是()
A.
清洁燃油箱及燃油漉网,然后对燃油系统做进一步的检查
B.
把燃油泵进口处清洁干净,再装上燃油泵就可以继续使用
【简答题】To produce the upheaval in the United States that changed and modernized higher education from the mid-1860s to the mid-1880s, several causes interacted. The emergence of a half-dozen leaders in educa...
【单选题】燃油泵进口处的燃油滤网被污染,以下做法正确的是( ) A. 清洁燃油箱及燃油滤网,然后对燃油系统做进一步检查B.把燃油泵进口处清理干净,再装上燃油泵就可以继续使用C.更换油泵,旧滤同可以继续使用D.必须更换全新噴油器
【简答题】已知f(x)=3 x ,f(a+2)=27,函数g(x)=λ?2 ax -4 x 的定义域为[0,2] (1)求a的值 (2)若函数g(x)的最大值是 1 3 ,求实数λ的值.
【单选题】The young adults who used to be aggressive but didn't watch much violent TV in childhood ______.
A.
turned out to be even more aggressive
B.
were less likely to get involved in crime
C.
showed a tendency to steal and fight aggressively
D.
became less aggressive than those watching violent TV shows in childhood
【简答题】直流电动机启动或运行状态为什么不允许失磁?
【简答题】构成建筑的基本要素有哪些 ? 它们之间有什么关系 ?