- length between perpendicularsl.b.pp
- length between perpendiculars?l.b.p
- 垂线: perpendicular; vertical; ver ...
- 间: space in between; opening
- 长度: length; longitude; size; ext ...
- 垂线间长度垂线间长两柱间长首尾垂线间长: length between perpendiculars
- 垂线间长: lbp; length b p; length between perpendiculars; lpp
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