Measuring the diameter of the raw glass rod is an important problem of quality control in the process of grin lens production.

在自聚焦透镜生产中涉及到一个重要的质量检测问题：毛坯玻璃丝的在线直径测量。

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Those obstacles included a recall over allegations of unintended sudden acceleration by Toyota vehicles, a problem that raised questions about the company's quality control, safety measures and customer service.

WSJ: Toyota Overhauls Management