为避免混凝土浇筑后裸露表面产生塑性收缩裂缝,在初凝、终凝前进行( )工序处理是非常关键的。
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混凝土由实验室配合比根据现场砂石含水率调整后的配合比称为( )。
During which phase of the software project management life cycle should testing occur?
A. validation
B. implementation
C. maintenance
D. testing occurs during each phase.