操作要求分批加入锰铁粉并按时捞渣。
Operation requires adding manganese iron powder in batches and removing slag on time.
通过分批加入尿素的方法，将尿素、 甲醛、 阻燃剂P800和硼砂反应制备阻燃脲醛树脂。
The fire-retardant urea-formaldehyde resins were synthesized with urea and formaldehyde and P800 and borax.
聚乙烯咔唑和重氮盐摩尔质量比1：4，重氮盐按分批加入方式加入到反应液中，反应时间96小时，反应温度室温。
The molar mass proportion of PVK and diazo salt is 1:4. Diazo salt was divided into several parts and added into solution in batches at room temperature to react for 96 hours.
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