seated L-square连座角尺
bare L-square直角尺
l-square直角尺;直角板
graduated L-square刻度角尺
Tetrahedral l and Square-planar Complexes四面体和平面四边形配合物
graduated l square刻度角尺
optical l square光学直角器
bevel l square斜角规
enamel l square plate搪瓷方盘