A project life cycle is a collection of generally sequential

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混凝土(concrete)

[单选题]A project life cycle is a collection of generally sequential project（）(1) whose name and number are determined by the control needs of the organization or organizations involved in the project. The life cycle provides the basic （）(2) for managing the project, regardless of the specific work involved.

A. D

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[单选题]耐碱混凝土的抗渗标号至少应达到（）

A. A、s4
B. B、s8
C. C、s12
D. D、s15

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