单选题：一个栈的初始状态为空。现将元素1，2，3，A，B，C依次入栈，然后再依次出栈，则元素出栈的顺序是

题目内容：
一个栈的初始状态为空。现将元素1，2，3，A，B，C依次入栈，然后再依次出栈，则元素出栈的顺序是 A．1，2，3，A，B，C
B．C，B，A，1，2，3
C．C，B，A，3，2，1
D．1，2，3，C，B，A

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答案解析：

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某施工单位承接了一段长30km的沥青混凝土路面施工,其中基层采用厂拌二灰稳定碎石,施工前选择了相应的施工机械并经计算确定了机械台数,施工工艺如下图所示。其中部分

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