The breech lock closure type heat exchanger is characterized by reliable sealing performance, easy dismantling and assembling, high utilization ratio of heat exchange area and small grounding.
螺纹锁紧环换热器具有密封性能可靠，拆装方便，换热面积的利用率高，结构紧凑，占地面积小等特点。
Rural residential area of our country has many problems on land using, such as the low land utilization ratio and the low volume rate.
我国农村居民点在土地利用上存在着土地利用率、容积率低的问题。
Catalyst activity was determined by not only specific surface area of catalyst but also the distributions of active center and utilization ratio of internal surface.
催化剂活性不仅与比表面有关，还与其活性中心分布情况、内表面利用率有关。
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