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單項選擇題

I在一個有向圖的拓撲序列中，若頂點a在頂點b之前，則圖中必有一條弧Ⅱ若一個有向圖的鄰接矩陣中對角線一下元素均為O，則該圖的拓撲序列必定存在Ⅲ在．AOE網(wǎng)中一定只有一條關鍵路徑

A.I、Ⅱ
B.Ⅱ、Ⅲ
C.I、Ⅲ
D.僅有Ⅱ

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ided to adjust the grades by deducting only half the number of points a student missed. For example, if a student missed 10 points, she received a 95 instead of a 90. Before the grades were adjusted the class average was A. What was the average after the adjustment？E．

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