• 2022-06-17
    电路如题 1-9 图所示, 其中 [tex=14.214x1.357]DYNGSsgBNsnxke/x00layu4zn8YpyLM66zqM4u+gJ+yvOFngwuw64RHnBMYW3faU[/tex] 若电路的输入电流为:[tex=8.214x2.214]gpo7ybwHNNorIAu+Y5JHLCLQ3mc2gdpXfZfGBjTqZDCYrHAm3gu/NOHRGYSyVq46[/tex]试求此种情况下, 当 t>0 时的 [tex=2.643x1.0]EGEsvl9vPPqdKHTZRtsNMw==[/tex] 和 [tex=1.143x1.0]COobowzLSkzn9yYIdZYGFg==[/tex] 值。[img=205x162]17a807d5e4cc7bf.png[/img] 
  • 根据R,L和C的u,i关系有 若[tex=7.929x2.214]gpo7ybwHNNorIAu+Y5JHLCLQ3mc2gdpXfZfGBjTqZDBo+dN4gzGgI1GzVV1uFFFy[/tex], 则有[tex=16.714x17.643]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[/tex]

    内容

    • 0

      set1 = {x for x in range(10)} print(set1) 以上代码的运行结果为? A: {0, 1, 2, 3, 4, 5, 6, 7, 8, 9} B: {0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10} C: {1, 2, 3, 4, 5, 6, 7, 8, 9} D: {1, 2, 3, 4, 5, 6, 7, 8, 9,10}

    • 1

      金属钽为体心立方结构,[tex=4.214x1.214]kkkYoI05u4ChnJgEE1R4ew==[/tex].试求:(1) [tex=1.143x1.0]4eDrZHZAIzExtkGR6sSw3A==[/tex] 的原子半径;(2) 金属钽的理论密度([tex=1.143x1.0]4eDrZHZAIzExtkGR6sSw3A==[/tex]的相对原子质量为 181 )(3) [tex=2.286x1.357]k968LmdN4QP2n2erOW6xuQ==[/tex]面间距;(4) 若用[tex=4.286x1.214]LBE56lFelwXqfcizY+UBF9x8t3BECirkYFW1iJ+kizg=[/tex]的X射线,衍射指标为 220 的衍射角[tex=0.5x1.0]qm+hGi0qngLh1B7HsENMPg==[/tex]是多少?

    • 2

      若要将一个长度为N=16的序列x(n)重新位倒序,作为某一FFT算法的输入,则位倒序后序列的样本序号为( )。 A: x(15), x(14), x(13), x(12), x(11), x(10), x(9), x(8), x(7), x(6),<br/>x(5), x(4), x(3), x(2), x(1), x(0) B: x(0), x(4), x(2), x(6), x(1), x(5), x(3), x(7), x(8), x(12), x(10),<br/>x(14), x(9), x(13), x(11), x(15) C: x(0), x(2), x(4), x(6), x(8), x(10), x(12), x(14), x(1), x(3), x(5),<br/>x(7), x(9), x(11), x(13), x(15) D: x(0), x(8), x(4), x(12), x(2), x(10), x(6), x(14), x(1), x(9), x(5),<br/>x(13), x(3), x(11), x(7), x(15)

    • 3

      写出如 图所示电路的状态方程(以[tex=0.857x1.214]C1zYBuZArr7QVQMP13MyUw==[/tex]和[tex=1.143x1.0]COobowzLSkzn9yYIdZYGFg==[/tex]为状态变量)。[img=308x189]17b15e82956912e.png[/img]

    • 4

      以4,9,1为为插值节点,求\(\sqrt x \)的lagrange的插值多项式 A: \( {2 \over {15}}(x - 9)(x - 1) + {3 \over {40}}(x - 4)(x - 1) + {1 \over {24}}(x - 4)(x - 9)\) B: \( - {2 \over {15}}(x - 9)(x - 1) + {3 \over {40}}(x - 4)(x - 1) + {1 \over {24}}(x - 4)(x - 9)\) C: \( - {2 \over {15}}(x - 9)(x - 1) + {3 \over {40}}(x - 4)(x +1) + {1 \over {24}}(x - 4)(x - 9)\) D: \( - {2 \over {15}}(x - 9)(x - 1) + {3 \over {40}}(x - 4)(x - 1) - {1 \over {24}}(x - 4)(x - 9)\)