圆形梯形图  circle trapezoid graphs

环形试片  ring specimen

流动性旋涡形试片  fluidity spiral

流动性直棒形试片  fluidity test bar piece; fluidity test barpiece

錀孔形试片  key hole specimen

楔形试片  wedge test piece

梯形矫正  Trapezia rectification

120-梯形波  120-degree trapezoidal

6R梯形磨  6R trapezoidal mill

DNA梯形带  DNA Laddering; DNA ladder

L-R梯形模糊数  L-R trapeziform fuzzy numbers

PLC逻辑梯形图  PLC logic ladder diagram

PLC梯形图  PLC ladder diagram; PLC LAD program

PLC梯形图程序  PLC LAD program

PLC梯形图设计  design of PLC ladder diagram

R-2R梯形网络  R-2R ladder

R-2R型梯形电阻网络  R-2R resistor ladder network

阿克姆梯形扣丝锥  tandem ACME tap

半梯形环  half keystone ring