The PPI is an economic indicator that tracks inflation in the U. S. economy.
产品价格指数（PPI）是用来追踪美国经济通货膨胀率的一个重要指标。
It can be equipped with test button and indicator according to user "s requirement."
可根据用户要求设置试验按钮和指示灯。
It can be equipped with test button and indicator according to user "s requirement."
可根据用户要求设置试验按钮和指示灯。
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