piping and instrument drawing 管道及仪表流程图

drawing instrument 绘图用具 ; 绘图仪器

precision drawing instrument set 成套精密绘图仪器

an instrument for drawing circles 圆规

instrument for drawing circles 画圆形的工具

drawing instrument assembler 绘图仪器装配工

perspective drawing instrument 透视绘图仪

curved drawing instrument 曲线板

drawing-instrument 绘图仪器