(b) The ODS was produced as by-product, captured through mandatory emission minimization measures, and exported for destruction. The ODS was sometimes stockpiled for export for destruction in a future year in order to minimize transport and destruction costs.
(b) 耗氧物质的来源计有以下几种：作为一种副产品进行的生产、基于强制性排放减少措施的回收作业、以及出于销毁目的而予以出口。