本局已经使用改装计划框架来建造和改善食品行业的设备：封闭玻璃罐头和瓶子、圆罐接缝气密性控制。
The bureau has used the framework of conversion program to create and improve equipment for food industry: for closure of glass cans and bottles, tightness control of the same, seaming of round tins.
最后，考虑先前测定的浓度变化率， 所述封闭空间的气密性值可以被计算出来。
Subsequently, an airtightness value of the enclosed space is calculated by taking into account the determined concentration modification rate.
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