题目内容

1)Whatisthemangoingtodotonight?

A. Setuphismum’scomputer.
Buyhismumabirthdaygift.
C. Solvehisdadscomputerproblems.
D. Helphisdadchooseanewcomputer.

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2)Whatdoesthemansaytheirparentswereunlucky?

A. Theyneverhadacomputeroftheirown.
B. Theyhadlittleornoexperiencewithcomputers.
C. Nobodytaughtthemhowtousecomputers.
D. Nobodyhelpedthemwiththeircomputerproblems.

建立3阶单位矩阵A的命令是()。

A=eye(3)
B. A=eye(3,1)
C. A=eye(1,3)
D. A=eyes(1,3)

建立5×6随机矩阵A,其元素为[100,200]范围内的随机整数,相应的命令是()。

A= fix(200*rand(5,6))
B. A= fix(201*rand(5,6))
C. A=fix(100+100*rand(5,6))
D. A=fix(100+101*rand(5,6))

产生均值为1、方差为0.2的500个正态分布的随机数,相应的命令是()。

A. 1+0.2+randn(500)
B. 1+sqrt(0.2)*randn(500)
C. 1+0.2+randn(25,20)
D. 1+sqrt(0.2)*randn(25,20)

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