• 2022-06-04 问题

    当n&#91;−2和n&#93;4时,x(n)=0。序列x(n−3)为零的n值范围是( )。 A: n=3 B: 1<n<7 C: n >7 D: n<1且n>7

    当n&#91;−2和n&#93;4时,x(n)=0。序列x(n−3)为零的n值范围是( )。 A: n=3 B: 1<n<7 C: n >7 D: n<1且n>7

  • 2022-06-07 问题

    重症人禽流感患者多由下列哪一亚型禽流感病毒感染引起() A: H<sub>9</sub>N<sub>2</sub> B: H<sub>7</sub>N<sub>7</sub> C: H<sub>5</sub>N<sub>1</sub> D: H<sub>1</sub>N<sub>1</sub> E: H<sub>3</sub>N<sub>7</sub>

    重症人禽流感患者多由下列哪一亚型禽流感病毒感染引起() A: H<sub>9</sub>N<sub>2</sub> B: H<sub>7</sub>N<sub>7</sub> C: H<sub>5</sub>N<sub>1</sub> D: H<sub>1</sub>N<sub>1</sub> E: H<sub>3</sub>N<sub>7</sub>

  • 2021-04-14 问题

    已知a=[1 2 3;5 6 7];b=[0 2 1;0 7 7];c=a==b,则c等于

    已知a=[1 2 3;5 6 7];b=[0 2 1;0 7 7];c=a==b,则c等于

  • 2022-06-03 问题

    已知矩阵M=&#91;1 2;3 4&#93;,N=&#91;1 2;1 3&#93;,则P=M*N的结果是 A: [3 8;7 18] B: [2 4;4 7] C: [1 4;3 12] D: [0 0;2 1]

    已知矩阵M=&#91;1 2;3 4&#93;,N=&#91;1 2;1 3&#93;,则P=M*N的结果是 A: [3 8;7 18] B: [2 4;4 7] C: [1 4;3 12] D: [0 0;2 1]

  • 2021-04-14 问题

    【单选题】Which of the following matrices does not have the same determinant of matrix B: [1, 3, 0, 2; -2, -5, 7, 4; 3, 5, 2, 1; -1, 0, -9,-5] A. [1, 3, 0, 2; -2, -5, 7, 4; 0, 0, 0, 0; -1, 0, -9, -5] B. [1, 3, 0, 2; -2, -5, 7, 4; 1, 0, 9, 5; -1, 0, -9, -5] C. [1, 3, 0, 2; -2, -5, 7, 4; 3, 5, 2, 1; -3, -5, -2, -1] D. [1, 3, 0, 2; -2, -5, 7, 4; 0, 0, 0, 1; -1, 0, -9, -5]

    【单选题】Which of the following matrices does not have the same determinant of matrix B: [1, 3, 0, 2; -2, -5, 7, 4; 3, 5, 2, 1; -1, 0, -9,-5] A. [1, 3, 0, 2; -2, -5, 7, 4; 0, 0, 0, 0; -1, 0, -9, -5] B. [1, 3, 0, 2; -2, -5, 7, 4; 1, 0, 9, 5; -1, 0, -9, -5] C. [1, 3, 0, 2; -2, -5, 7, 4; 3, 5, 2, 1; -3, -5, -2, -1] D. [1, 3, 0, 2; -2, -5, 7, 4; 0, 0, 0, 1; -1, 0, -9, -5]

  • 2022-06-07 问题

    下面哪段语句不会报错? A: x = ones(1,4);nh = 0:2;h = (nh+1)* ones(1,3);n=0:5;y=conv(x,h);stem(n,y); B: x = [1 2 3];h = ones(1,5);n=0:7;y=conv(x,h);stem(n,y); C: x = ones(1,5);nh = 0:2;h = (nh+1).* ones(1,3);n=0:6;y=conv(x,h);stem(n,y);

    下面哪段语句不会报错? A: x = ones(1,4);nh = 0:2;h = (nh+1)* ones(1,3);n=0:5;y=conv(x,h);stem(n,y); B: x = [1 2 3];h = ones(1,5);n=0:7;y=conv(x,h);stem(n,y); C: x = ones(1,5);nh = 0:2;h = (nh+1).* ones(1,3);n=0:6;y=conv(x,h);stem(n,y);

  • 2022-06-07 问题

    下面哪段语句不会报错? A: x = [1 2 3];h = ones(1,5);n=0:7;y=conv(x,h);stem(n,y); B: x = ones(1,4);nh =0:2;h = (nh+1) ones(1,3);n=0:5;y=conv(x,h);stem(n,y); C: x = ones(1,5);nh =0:2;h = (nh+1). ones(1,3);n=0:6;y=conv(x,h);stem(n,y);

    下面哪段语句不会报错? A: x = [1 2 3];h = ones(1,5);n=0:7;y=conv(x,h);stem(n,y); B: x = ones(1,4);nh =0:2;h = (nh+1) ones(1,3);n=0:5;y=conv(x,h);stem(n,y); C: x = ones(1,5);nh =0:2;h = (nh+1). ones(1,3);n=0:6;y=conv(x,h);stem(n,y);

  • 2022-06-04 问题

    当n&#91;−2和n&#93;4时,x(n)=0。序列x(n−3)为零的n值范围是( )。 A: n=3 B: n<7 C: n >7 D: n<1且n>7

    当n&#91;−2和n&#93;4时,x(n)=0。序列x(n−3)为零的n值范围是( )。 A: n=3 B: n<7 C: n >7 D: n<1且n>7

  • 2022-06-15 问题

    设当n&#91;-2和n&#93;4时,x(n)=0,则序列x(n-3)为零的n值为 A: n=3 B: n<7 C: n>7 D: n<1和n>7

    设当n&#91;-2和n&#93;4时,x(n)=0,则序列x(n-3)为零的n值为 A: n=3 B: n<7 C: n>7 D: n<1和n>7

  • 2022-05-28 问题

    1, 1, (), 2, 16/5, 16/3 A: 8/2 B: 4/3 C: 16/7 D: 2

    1, 1, (), 2, 16/5, 16/3 A: 8/2 B: 4/3 C: 16/7 D: 2

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