设函数f(x)=x2,0≤x<1,而,其中sinnπxdx,n=1,2,3,…,则等于(). A: B: C: D:
设函数f(x)=x2,0≤x<1,而,其中sinnπxdx,n=1,2,3,…,则等于(). A: B: C: D:
当[img=45x11]17e0aa6b7b1e1d3.jpg[/img]时,下列数列极限存在的是() 未知类型:{'options': ['', ' [img=36x31]17e0aa6b8445e7b.jpg[/img]', ' [img=14x14]17e0a69c3524a5b.jpg[/img]', ' sinn'], 'type': 102}
当[img=45x11]17e0aa6b7b1e1d3.jpg[/img]时,下列数列极限存在的是() 未知类型:{'options': ['', ' [img=36x31]17e0aa6b8445e7b.jpg[/img]', ' [img=14x14]17e0a69c3524a5b.jpg[/img]', ' sinn'], 'type': 102}
设函数f(x)=x2(0≤x<1),而S(x)=bnsinnπx,其中bn=2f(x)sinnπxdx(n=1,2,…),则S==() A: -(1/2) B: -(1/4) C: 1/4 D: 1/2
设函数f(x)=x2(0≤x<1),而S(x)=bnsinnπx,其中bn=2f(x)sinnπxdx(n=1,2,…),则S==() A: -(1/2) B: -(1/4) C: 1/4 D: 1/2
Which of the following statements is Not true? () A: Sinn Fein is a legal political party in Northern Ireland B: Those who want to unite Northern Ireland with Britain are called Unionists C: The Social Democratic and Labor Party is a very important political party in Britain D: Those who showed their loyalty to the British Crown are called Loyalists
Which of the following statements is Not true? () A: Sinn Fein is a legal political party in Northern Ireland B: Those who want to unite Northern Ireland with Britain are called Unionists C: The Social Democratic and Labor Party is a very important political party in Britain D: Those who showed their loyalty to the British Crown are called Loyalists
1. 下列关于等间距均匀点源离散直线阵远场辐射声压的描述,正确的有( )。 A: 辐射声压具有指向性 B: 指向性函数为:sinN C: 辐射声压无指向性 D: 最大响应方向为基阵的法线方向
1. 下列关于等间距均匀点源离散直线阵远场辐射声压的描述,正确的有( )。 A: 辐射声压具有指向性 B: 指向性函数为:sinN C: 辐射声压无指向性 D: 最大响应方向为基阵的法线方向