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- 问:请问JB-19和JB-20伸缩管单式和复式有什么不同之处?还有,在口径500mm的时候伸缩行程最长可以达到多少? 张工
答:您好!JB-19单式,JB-20复式。感谢您对上海进口仪器仪表供应站的支持和关注! 在线技术支持