成年女子宫体与宫颈的比便是 A: 2:1\n B: 1:2\n C: 1:1\n D: 3:1\n E: 3:2
成年女子宫体与宫颈的比便是 A: 2:1\n B: 1:2\n C: 1:1\n D: 3:1\n E: 3:2
设`\n`阶方阵`\A`满足`\|A| = 2`,则`\|A^TA| = ,|A^{ - 1}| = ,| A^ ** | = ,| (A^ ** )^ ** | = ,|(A^ ** )^{ - 1} + A| = ,| A^{ - 1}(A^ ** + A^{ - 1})A| = `分别等于( ) A: \[4,\frac{1}{2},{2^{n - 1}},{2^{{{(n - 1)}^2}}},2{(\frac{3}{2})^n},\frac{{{3^n}}}{2}\] B: \[2,\frac{1}{2},{2^{n - 1}},{2^{{{(n + 1)}^2}}},2{(\frac{3}{2})^n},\frac{{{3^n}}}{2}\] C: \[4,\frac{1}{2},{2^{n + 1}},{2^{{{(n - 1)}^2}}},2{(\frac{3}{2})^{n - 1}},\frac{{{3^n}}}{2}\] D: \[2,\frac{1}{2},{2^{n - 1}},{2^{{{(n - 1)}^2}}},2{(\frac{3}{2})^{n - 1}},\frac{{{3^n}}}{2}\]
设`\n`阶方阵`\A`满足`\|A| = 2`,则`\|A^TA| = ,|A^{ - 1}| = ,| A^ ** | = ,| (A^ ** )^ ** | = ,|(A^ ** )^{ - 1} + A| = ,| A^{ - 1}(A^ ** + A^{ - 1})A| = `分别等于( ) A: \[4,\frac{1}{2},{2^{n - 1}},{2^{{{(n - 1)}^2}}},2{(\frac{3}{2})^n},\frac{{{3^n}}}{2}\] B: \[2,\frac{1}{2},{2^{n - 1}},{2^{{{(n + 1)}^2}}},2{(\frac{3}{2})^n},\frac{{{3^n}}}{2}\] C: \[4,\frac{1}{2},{2^{n + 1}},{2^{{{(n - 1)}^2}}},2{(\frac{3}{2})^{n - 1}},\frac{{{3^n}}}{2}\] D: \[2,\frac{1}{2},{2^{n - 1}},{2^{{{(n - 1)}^2}}},2{(\frac{3}{2})^{n - 1}},\frac{{{3^n}}}{2}\]
设随机变量X~N(1, 1),则Y=2X+1服从()分布 A: N(3, 3) B: N(3, 4) C: N(3, 5) D: N(1, 3)
设随机变量X~N(1, 1),则Y=2X+1服从()分布 A: N(3, 3) B: N(3, 4) C: N(3, 5) D: N(1, 3)
将\(f(x)=e^x\)展开成\((x-3)\)的幂级数为( )。 A: \(\sum\limits_{n = 0}^\infty { { { { {(x - 3)}^n}} \over {n!}}} \matrix{ {} & {} \cr } ( - 1, 1)\) B: \({e^3}\sum\limits_{n = 0}^\infty { { { { {(x - 3)}^n}} \over {n!}}} \matrix{ {} & {} \cr } ( - 1, 1)\) C: \(\sum\limits_{n = 0}^\infty { { { { {(x - 3)}^n}} \over {n!}}} \matrix{ {} & {} \cr } ( - \infty , + \infty )\) D: \({e^3}\sum\limits_{n = 0}^\infty { { { { {(x - 3)}^n}} \over {n!}}} \matrix{ {} & {} \cr } ( - \infty , + \infty )\)
将\(f(x)=e^x\)展开成\((x-3)\)的幂级数为( )。 A: \(\sum\limits_{n = 0}^\infty { { { { {(x - 3)}^n}} \over {n!}}} \matrix{ {} & {} \cr } ( - 1, 1)\) B: \({e^3}\sum\limits_{n = 0}^\infty { { { { {(x - 3)}^n}} \over {n!}}} \matrix{ {} & {} \cr } ( - 1, 1)\) C: \(\sum\limits_{n = 0}^\infty { { { { {(x - 3)}^n}} \over {n!}}} \matrix{ {} & {} \cr } ( - \infty , + \infty )\) D: \({e^3}\sum\limits_{n = 0}^\infty { { { { {(x - 3)}^n}} \over {n!}}} \matrix{ {} & {} \cr } ( - \infty , + \infty )\)
31. 计算e=1+1/1!+1/2!+1/3!+...+1/n!,直到累加项1/n!<1E-4为止。
31. 计算e=1+1/1!+1/2!+1/3!+...+1/n!,直到累加项1/n!<1E-4为止。
编写程序,求e≈1+1/1!+1/2!+1/3!+1/4!+…+1/n!
编写程序,求e≈1+1/1!+1/2!+1/3!+1/4!+…+1/n!
脊髓前动脉供血范围大致包括脊髓横断面的 A: 前3/4\n B: 前1/3\n C: 前2/3\n D: 前1/2\n E: 前1/4
脊髓前动脉供血范围大致包括脊髓横断面的 A: 前3/4\n B: 前1/3\n C: 前2/3\n D: 前1/2\n E: 前1/4
下列量子数能完整表示某原子3p1轨道上电子运动状态的是: A: n = 3 B: n = 3,l = 1 C: n = 3,l = 1,m = 1,ms = +1/2 或者ms =-1/2 D: n= 3,l= 1,m= 0,ms= +1/2或者ms=-1/2 E: n= 3,l= 1,m= -1,ms= +1/2或者ms=-1/2
下列量子数能完整表示某原子3p1轨道上电子运动状态的是: A: n = 3 B: n = 3,l = 1 C: n = 3,l = 1,m = 1,ms = +1/2 或者ms =-1/2 D: n= 3,l= 1,m= 0,ms= +1/2或者ms=-1/2 E: n= 3,l= 1,m= -1,ms= +1/2或者ms=-1/2
已知x(n)={1, 2, 3},y(n)={1, 2, 1},则x(n)*y(n)=________。(下划线表示n=0) A: {1, 4, 8, 8, 3} B: {1, 4, 8, 8, 3} C: {1, 4, 8, 8, 3} D: {1, 4, 8, 8, 3}
已知x(n)={1, 2, 3},y(n)={1, 2, 1},则x(n)*y(n)=________。(下划线表示n=0) A: {1, 4, 8, 8, 3} B: {1, 4, 8, 8, 3} C: {1, 4, 8, 8, 3} D: {1, 4, 8, 8, 3}
下列各组量子数,正确的是( ) A: n = 3,l = 2,m = 1 B: n = 3,l = 1,m = 2 C: n = 3,l = 0,m = 1 D: n = 3,l = 3,m = 1
下列各组量子数,正确的是( ) A: n = 3,l = 2,m = 1 B: n = 3,l = 1,m = 2 C: n = 3,l = 0,m = 1 D: n = 3,l = 3,m = 1