单选题指数方程组的解()。

单选题设f(x)在x=0的某邻域内连续，在x=0处可导，且f(0)=0．则φ(x)在x=0处

单选题若是xf(x)的一个原函数，则

单选题若四阶行列式D中第4行的元素自左向右依次为1，2，0，0，余子式M41=2，M42=3，则四阶行列式D=( )． (a)-8 (b)8 (c)-4 (d)4

单选题设直线y=ax+b同时与曲线y=x2及相切，则常数a=______，b=______．

单选题不等式lgx+lg(x-3)＜1的解集是( )． (A) (-2，5) (B) (3，5) (C) (3，6) (D) (5，6) (E) A、B、C、D均不正确

单选题设f(x)在[a，b]上连续，则的值()。A．小于零B．等于零C．大于零D．不确定

单选题设n阶矩阵A与B等价，则必有( )． (A) 当|A|=a(a≠0)，有|B|=a (B) 当|A|=a(a≠0)，有|B|=-a (C) 当|A|≠0，有|B|=0 (D) 当|A|=0，有|B|=0

单选题设f(x)在x0处不连续，则______A．f"(x0)必存在B．f"(x0)必不存在C．必存在D．必不存在

单选题n阶实对称矩阵A正定的充分必要条件是______．

单选题毛泽东关于建党思想最突出的特点是______。 A．政治上建设党 B．思想上建设党 C．组织上建设党 D．作风上建设党

单选题函数的单调递减区间为{{U}}{{/U}}。A.(-∞，-3)和(3，+∞)B.(-3，3)C.(-∞，0)和(0，+∞)D.(-3，0)和(0，3)

单选题设，则f(x，y)=____

单选题设f(x)＞0，且导数存在，则=______。A．0B．∞C．lnf'(a)D．

单选题Du Bois was a sociological and educational pioneer who challenged the established system of education that tended to restrict rather than to advance the progress of black Americans. He challenged what is called the “Tuskegee machine” of Booker T. Washington, the leading educational spokesperson of the blacks in the U. S. . As a sociologist and historian, Du Bois called for a more determined and activist leadership than Washington provided. Unlike Washington, whose roots were in southern black agriculture, Du Bois’s career spanned both sides of the Mason-Dixon Line. He was a native of Massachusetts, received his undergraduate education from Fisk University in Nashville, did his graduate study at Harvard University, and directed the Atlanta University Studies of Black American Life in the South. Du Bois approached the problem of racial relations in the United States from two dimensions: as a scholarly researcher and as an activist for civil rights. Among his works was the famous empirical sociological study, The Philadelphia Negro: A Social Study, in which he examined that city’s black population and made recommendations for the school system. Du Bois’s Philadelphia study was the pioneer work on urban blacks in America. Du Bois had a long and active career as a leader in the civil rights movement. He helped to organize the Niagara Movement in 1905, which led to the National Association for the Advancement of Colored People (NAACP), established in 1909. From 1910 until 1934, Du Bois edited The Crisis, the major journal of the NAACP. In terms of its educational policy, the NAACP position was that all American children and youth should have genuine equality of educational opportunity. This policy, which Du Bois helped to formulate, stressed the following themes: (1) public schooling should be free and compulsory for all American children; (2) secondary schooling should be provided for all youth; (3) higher education should not be monopolized by any special class or race. As a leader in education, Du Bois challenged not only the tradition of racial segregation in the schools but also the accommodationist ideology of Booker T. Washington. The major difference between the two men was that Washington sought change that was evolutionary in nature and did not upset the social order, whereas Du Bois demanded immediate change. Du Bois believed in educated leadership for blacks, and he developed a concept referred to as the “talented tenth”, according to which 10 percent of the black population would receive a traditional college education in preparation for leadership.

单选题曲线y=x(x-1)(2-x)与x轴所围图形面积可表示为A．B．C．D．

单选题有些列关于数项级数的命题(1)若≠0，则必发散；(2)若un≥0，un≥un+1(n=1，2，3，…)且必收敛；(3)若收敛，则必收敛；(4)若收敛于s，则任意改变该级数项的位置所得到的新的级数仍收敛于s．其中正确的命题个数为

单选题设n为正整数，在1与n+1之间插入n个正数，使这n+2个数成等比数列，则所插入的n个正数之积等于______。A．B．(1+n)nC．(1+n)2nD．(1+n)3n

单选题曲线

单选题不等式的解集为______。A．[-1，0)B．[-1，+∞)C．(-∞，-1]D．(-∞，-1]∪(0，+∞)