Using the problem stated in the Special window, Calculate the deviation of duration for the task, using the PERT concept of standard deviation of task duration.A . 0.5B . 1C . 1.8D . 2.2E . 2.8

题目

Using the problem stated in the Special window, Calculate the deviation of duration for the task, using the PERT concept of standard deviation of task duration.

A . 0.5

B . 1

C . 1.8

D . 2.2

E . 2.8

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  • 第1题：

    Magnetic heading differs from compass heading by______．

    A.compass error

    B.true heading

    C.variation

    D.Deviation


    正确答案：D
    磁首向不同于罗经首向在于自差。

  • 第2题：

    下列定义的外部中断0函数正确的是（）。

    A．void int0() interrupt 1 using 0

    B．void int0() interrupt 0 using 0

    C．void int0() interrupt 2 using 0

    D．void int0() interrupt 3 using 0


    void int0( ) interrupt 0 using 0

  • 第3题：

    下列定义的外部中断0函数正确的是（）。

    A．void int0() interrupt 0 using 0

    B．void int0() interrupt 1 using 0

    C．void int0() interrupt 3 using 0

    D．void int0() interrupt 3 using 0


    void int0( ) interrupt 0 using 0

  • 第4题：

    下列样式代码中，可精确定义元素位置的是（）

    A．special{ position: absolute;}

    B．special{ position: absolute; top:20px; left:16px;}

    C．special{ position: relative;; top:20px; left:16px;}

    D．special{ position: relative;}


    BC

  • 第5题：

    【多选题】下列样式代码中，可精确定义元素位置的是：

    A．.special{ position: absolute;}

    B．.special{ position: absolute; top:20px; left:16px;}

    C．.special{ position: relative;; top:20px; left:16px;}

    D．.special{ position: relative;}


    BC

  • 第6题：

    2、下列定义的外部中断0函数正确的是（）。

    A．void int0() interrupt 0 using 0

    B．void int0() interrupt 1 using 0

    C．void int0() interrupt 3 using 0

    D．void int0() interrupt 3 using 0


    void int0( ) interrupt 0 using 0

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