函数$f(x)=x+\sin x$的( )。 A: 上凸区间为$(2n\text{ }\!\!\pi\!\!\text{ },(2n+1)\text{ }\!\!\pi\!\!\text{ })$,下凸区间为$((2n-1)\text{ }\!\!\pi\!\!\text{ },2n\text{ }\!\!\pi\!\!\text{ })$ B: 上凸区间为$((2n-1)\text{ }\!\!\pi\!\!\text{ },2n\text{ }\!\!\pi\!\!\text{ })$,下凸区间为$(2n\text{ }\!\!\pi\!\!\text{ },(2n+1)\text{ }\!\!\pi\!\!\text{ })$ C: 上凸区间为$(n\text{ }\!\!\pi\!\!\text{ },(n+1)\text{ }\!\!\pi\!\!\text{ })$,下凸区间为$((n-1)\text{ }\!\!\pi\!\!\text{ },n\text{ }\!\!\pi\!\!\text{ })$ D: 上凸区间为$((n-1)\text{ }\!\!\pi\!\!\text{ },n\text{ }\!\!\pi\!\!\text{ })$,下凸区间为$(n\text{ }\!\!\pi\!\!\text{ },(n+1)\text{ }\!\!\pi\!\!\text{ })$
函数$f(x)=x+\sin x$的( )。 A: 上凸区间为$(2n\text{ }\!\!\pi\!\!\text{ },(2n+1)\text{ }\!\!\pi\!\!\text{ })$,下凸区间为$((2n-1)\text{ }\!\!\pi\!\!\text{ },2n\text{ }\!\!\pi\!\!\text{ })$ B: 上凸区间为$((2n-1)\text{ }\!\!\pi\!\!\text{ },2n\text{ }\!\!\pi\!\!\text{ })$,下凸区间为$(2n\text{ }\!\!\pi\!\!\text{ },(2n+1)\text{ }\!\!\pi\!\!\text{ })$ C: 上凸区间为$(n\text{ }\!\!\pi\!\!\text{ },(n+1)\text{ }\!\!\pi\!\!\text{ })$,下凸区间为$((n-1)\text{ }\!\!\pi\!\!\text{ },n\text{ }\!\!\pi\!\!\text{ })$ D: 上凸区间为$((n-1)\text{ }\!\!\pi\!\!\text{ },n\text{ }\!\!\pi\!\!\text{ })$,下凸区间为$(n\text{ }\!\!\pi\!\!\text{ },(n+1)\text{ }\!\!\pi\!\!\text{ })$
中国大学MOOC: Directions: Fill in the blank in the following sentence with an exact word from the text.But the genius of General Xiang Yus ____ would be validated both on the battlefield and in modernsocial science research.
中国大学MOOC: Directions: Fill in the blank in the following sentence with an exact word from the text.But the genius of General Xiang Yus ____ would be validated both on the battlefield and in modernsocial science research.
There are _____ texts. They are Text A _________________, Text B _________________, Text C _________________, Text D _________________.
There are _____ texts. They are Text A _________________, Text B _________________, Text C _________________, Text D _________________.
There five texts in Chapter 6. Text A _________________________; Text B _______________________; Text C _______________________; Text C _______________________; Text E _______________________;
There five texts in Chapter 6. Text A _________________________; Text B _______________________; Text C _______________________; Text C _______________________; Text E _______________________;
对数螺线$r={{\text{e}}^{\theta }}$在$\theta =\frac{\text{ }\!\!\pi\!\!\text{ }}{2}$对应点处的切线的直角坐标方程为( )。 A: $y+x={{\text{e}}^{\frac{\text{ }\!\!\pi\!\!\text{ }}{2}}}$ B: $y-x={{\text{e}}^{\frac{\text{ }\!\!\pi\!\!\text{ }}{2}}}$ C: $y={{\text{e}}^{\frac{\text{ }\!\!\pi\!\!\text{ }}{2}}}(x+1)$ D: $y={{\text{e}}^{\frac{\text{ }\!\!\pi\!\!\text{ }}{2}}}(x-1)$
对数螺线$r={{\text{e}}^{\theta }}$在$\theta =\frac{\text{ }\!\!\pi\!\!\text{ }}{2}$对应点处的切线的直角坐标方程为( )。 A: $y+x={{\text{e}}^{\frac{\text{ }\!\!\pi\!\!\text{ }}{2}}}$ B: $y-x={{\text{e}}^{\frac{\text{ }\!\!\pi\!\!\text{ }}{2}}}$ C: $y={{\text{e}}^{\frac{\text{ }\!\!\pi\!\!\text{ }}{2}}}(x+1)$ D: $y={{\text{e}}^{\frac{\text{ }\!\!\pi\!\!\text{ }}{2}}}(x-1)$
The text can be classified into three types: ______, ______ and ______. A: informative text B: functional text C: expressive text D: operative text
The text can be classified into three types: ______, ______ and ______. A: informative text B: functional text C: expressive text D: operative text
以下哪段代码不能正确创建函数show()?() A: functionshow(text){alert(text);} B: varshowFun=functionshow(text){alert(text);} C: varshowFun=function(text){alert(text);} D: varshowFun=newfunction("text","alert(text)"};
以下哪段代码不能正确创建函数show()?() A: functionshow(text){alert(text);} B: varshowFun=functionshow(text){alert(text);} C: varshowFun=function(text){alert(text);} D: varshowFun=newfunction("text","alert(text)"};
若函数$y=y(x)$由方程${{\text{e}}^{x+y}}=xy+1$确定,则 ( )。 A: $\text{d}x=\frac{{{\text{e}}^{x+y}}-x}{y-{{\text{e}}^{x+y}}}\text{d}y$ B: $\text{d}y=\frac{{{\text{e}}^{x+y}}-x}{y-{{\text{e}}^{x+y}}}\text{d}x$ C: $\text{d}x=\frac{{{\text{e}}^{x+y}}+x}{y+{{\text{e}}^{x+y}}}\text{d}y$ D: $\text{d}y=\frac{{{\text{e}}^{x+y}}+x}{y+{{\text{e}}^{x+y}}}\text{d}x$
若函数$y=y(x)$由方程${{\text{e}}^{x+y}}=xy+1$确定,则 ( )。 A: $\text{d}x=\frac{{{\text{e}}^{x+y}}-x}{y-{{\text{e}}^{x+y}}}\text{d}y$ B: $\text{d}y=\frac{{{\text{e}}^{x+y}}-x}{y-{{\text{e}}^{x+y}}}\text{d}x$ C: $\text{d}x=\frac{{{\text{e}}^{x+y}}+x}{y+{{\text{e}}^{x+y}}}\text{d}y$ D: $\text{d}y=\frac{{{\text{e}}^{x+y}}+x}{y+{{\text{e}}^{x+y}}}\text{d}x$
Which of the following is not a basic procedure for text mining? A: Text preprocessing B: Text classification C: Text transformation D: Text mining
Which of the following is not a basic procedure for text mining? A: Text preprocessing B: Text classification C: Text transformation D: Text mining
以下哪段代码能正确创建函数show() A: var showFun = new function{"text","alert(text)"}; B: function show(text){alert(text);} C: var showFun = function show(text){alert(text);} D: var showFun = function(text){alert(text);}
以下哪段代码能正确创建函数show() A: var showFun = new function{"text","alert(text)"}; B: function show(text){alert(text);} C: var showFun = function show(text){alert(text);} D: var showFun = function(text){alert(text);}