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Ithasbeendeterminedthatprintjobsfromanapplicationarenotbeingremovedfromthesystemaftertheyhavebeenprinted.Toremovethesejobsfromthe/var/spooldirectory,whichcronentrywillremovefilesmorethan7daysold?()A.find/var/spool/lpd/qdir-mtime-7-typef-execrm-f{}\B.find-

题目
Ithasbeendeterminedthatprintjobsfromanapplicationarenotbeingremovedfromthesystemaftertheyhavebeenprinted.Toremovethesejobsfromthe/var/spooldirectory,whichcronentrywillremovefilesmorethan7daysold?()

A.find/var/spool/lpd/qdir-mtime-7-typef-execrm-f{}\

B.find-name/var/spool/*-frm{}\

C.find-name/var/spool/lpd/*-execrm{}\

D.find/var/spool/lpd/qdir-mtime+7-typef-execrm-f{}\


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  • 第1题:

    根据下面的定义,F0(3+4)的输出结果是_______(注意没有空格)#define F1(var) printf("var=%d", var) #define F0(var) F1(var * var)

    根据下面的定义,F0(3+4)的输出结果是_______(注意没有空格)#define F1(var) printf("var=%d", var) #define F0(var) F1(var * var)


    C

  • 第2题:

    (X,Y)是二维随机向量,下列命题与Cov(X,Y)=0等价的是

    A.E(XY)=E(X)E(Y)

    B.Var(XY)= Var(X)Var(Y)

    C.Var(X+Y)=Var(X)−Var(Y)

    D.Var(X−Y)=Var(X) −Var(Y)


    E ( XY )= E ( X ) E ( Y )

  • 第3题:

    下列哪个函数表达式可以计算变量var1,var2和var3的平均值? ()

    A.mean(var1, var3)

    B.mean(var1-var3)

    C.mean(of var1-var3)

    D.mean(of var1,var3)


    mean(of var1-var3)

  • 第4题:

    设随机变量X的方差存在,Var(X)>0,则以下结论正确的是

    A.Var(X) > Var(1-X)

    B.Var(X) < Var(1-X)

    C.Var(X) = Var(1-X)

    D.Var(X) + Var(1-X) = 1


    C

  • 第5题:

    22、设随机变量X的方差存在,Var(X)>0,则以下结论正确的是

    A.Var(X) > Var(1-X)

    B.Var(X) < Var(1-X)

    C.Var(X) = Var(1-X)

    D.Var(X) + Var(1-X) = 1


    Var( X ) = Var(1 - X )