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To improve the quality of construction, a certain project conducted sample inspections on the precision of template installation, and 50 defects were identified. Among the factors contributing to these defects, 31 cases were due to insufficient surface flatness, 6 cases resulted from incorrect cross-sectional dimensions, 3 cases were caused by inadequate levelness of the surfaces, 1 case was related to poor verticality, and 9 cases were due to incorrect elevation levels. According to the ABC classification method in Pareto charts, the problems that belong to category A are ( ). A. Surface flatness, cross-sectional dimensions B. Cross-sectional dimensions, plane levelness, perpendicularity C. Surface flatness, elevation D. Surface flatness, cross-sectional dimensions, plane levelness Correct answer: C
To improve the quality of construction, a certain project conducted sample inspections on the precision of template installation, and 50 defects were identified. Among the factors contributing to these defects, 31 cases were due to insufficient surface flatness, 6 cases resulted from incorrect cross-sectional dimensions, 3 cases were caused by inadequate levelness of the surfaces, 1 case was related to poor verticality, and 9 cases were due to incorrect elevation levels. According to the ABC classification method in Pareto charts, the problems that belong to category A are ( C ). A、Surface flatness, cross-sectional dimensions B、Cross-sectional dimensions, plane levelness, perpendicularity C、Surface flatness, elevation D、Surface flatness, cross-sectional dimensions, plane levelness