在火电厂中一直是测量燃烧过程出口的烟气含氧量来控制燃烧效率。
In the power plant, the excess oxygen in flue gas has been measured and used to control the combustion efficiency.
40年前，出口或进口的过程涉及到许多操作步骤，这可能会导致一部分货物在运输过程中受损或被盗。
Forty years ago, the process of exporting or importing involved a great many stages of handling, which risked portions of the shipment being damaged or stolen along the way.
熟悉常见的纳税人贸易企业，包括退还出口税的过程及其截止日期。
Be familiar with the common taxpayer trading enterprises including refunding export taxes process and its deadlines.
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