在质量控制中,控制图主要用于( )。
A. 识别异常波动
B. 判断产品是否合格
C. 计算过程能力指数
D. 分析质量数据的分布
In quality control, control charts are mainly used for ().
A. Identify abnormal fluctuations
B. Determine whether the product is qualified
C. Calculation process capability index
D. Analyze the distribution of quality data