本实用新型具有以 下优点：一是塑料的器体成型变化多，开孔率高，通气性好；
The plastics-steel combination flame-retardant barn ventilator has the advantages that: first, the plastic container has a plurality of forming changes, high hole rate and good ventilation;
还有个比较功能，给负责学生制作方法随时间变化的老师提供了一款成型的评价工具。
It also has a "compare" feature which makes for a great formative assessment tool for teachers looking to measure change over time in a student product.
在注塑成型时，整个填料过程始终保持成型树脂高温的任何加工变化都会增加松弛作用而减少方向性。
In injection molding, any variation in processing that keeps the molding resin hot throughout filling allows increased relaxation and, therefore, decreased orientation.
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