The orifice plate box technique of gas regulating units in cokemakingoven has been put in practical use in many coking and chemical plants.
炼焦炉煤气调节装置孔板盒技术已在许多焦化厂投入使用。
At the bottom of this plate, an aperture had been pierced exactly similar to the orifice of a letter box.
在那铁皮的下方，开了一个口，和信箱的口完全同一样。
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