... 数据结构 data construction 加长轴杆 stem extension 圆润流转 round and flowing ...
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stem extension assembly 阀杆延伸组件
valve stem extension 气门杆伸出部
extension stem 伸长杆
extension stem-operation 伸长杆操作
Adequate and rigid support must be provided for long stem extension units.
对于长阀杆的延长装置，需要提供适当的和坚固的支撑座。
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Andrea Kneer-Rice is a 4-H educator at the University of Maryland Extension, with a focus in STEM education.
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