Many such codes exist – NAICS, UN/SPC, SIC Codes, etc. – and are widely used to classify businesses, industries, and product categories.
现在已经存在许多这样的类别编码,比如naics,un/spc,sic编码等等,这些编码被广泛用于商业。
The main causes of poisoning incidents were due to lacking, un using or misusing personal protective equipments, lacking safety education etc.
中毒发生的主要直接原因是没有个人防护设备、不使用个人防护用品或使用不当以及缺乏安全教育等;
It also points out that the factors affecting smelting process are un- der the follows, such as, grain size of raw material, burden weighing and mixing etc.
并提出了影响铁合金冶炼过程有原料的粒度,配料称量,混合等重要因素。
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