气动绞车操作者要确认气动绞车钢丝绳和井架不干涉(可以用滑轮导向)，以避免损伤井架的钢结构，特别是指梁。
The air winch Operator shall ensure that the winch wire is moving freely in the derrick (possibly guided by pulleys) to avoid any damage to the steel structure, especially the fingerboard.
体外预应力是指预应力筋布置在混凝土梁体以外的预应力，与之相对的即为传统的预应力筋布置在构件截面内的有粘结或无粘结预应力。
External prestressing means that the prestressing bars are disposed outside the beam bodies, which in tradition are inside the beams with or without bond.
本文研制的体硅工艺微振动传感器，其敏感单元为叉指电极结构，弹性梁采用新颖的多级折梁结构。
The sensing element of the bulk machining vibration sensors is consisted of comb electrodes, and its elastic beams are novel multi-folding beams.
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