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【单选题】
某A项工作有两项紧后工作D和E, D的最迟完成时间为20d,持续时间为13d; E的最迟时间为25d,持续时间为15d。则A工作的最迟完成时间为( )d。
A.
20
B.
15
C.
10
D.
7
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举一反三
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D.
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A.
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B.
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C.
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A.
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B.
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D.
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A.
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B.
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C.
降低
D.
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