single round holeless flange 无孔圆单法兰盘
round d flange 法兰盘
·2,447,543篇论文数据，部分数据来源于NoteExpress
Square flange heaters (boiler heaters) are suitable for constrained areas, square and round flanges are made of compact elements that are easily installed by tightening a series of bolts.
锅炉加热器适合用于限制区，方形和由小型加热元件制成的圆形法兰。
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