题目内容
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甲、乙两车分别从A、B两地同时出发，相向而行，3小时后两车相遇。相遇后，甲车调头返回A地。乙车继续往
前行驶。甲车到达A地后又调头行驶，半个小时后遇到乙车。问乙车从B地到A地需要多少小时？
A.4．5
B.6
C.7．2
D.8
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What is the purpose of the work breakdown structure （WBS)？A.The WBS allows the project man
What is the purpose of the work breakdown structure (WBS)？
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B.The WBS is a narrative description of the work required for the project
C.The WBS describes the total program as a summation of subdivided elements
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