理学 3D打印中的几何计算 释 fused deposition modeling; FDM 支撑结构的计算与优化 熔融沉积式打印机（fused deposition modeling，FDM）由于价格低廉、操作简单而具有较高的普及程度。但其最大的缺点是无法直接打印模型中的悬空部位。这时往往需要用户在切片之前给悬空部分添加支撑结构，将支撑结构连同模型一起被打印，并在结束后人为去除。
网络与数据通信 协议体系与组成结构 释文 frequency division multiplexing, FDM 频分多路复用
- threat strategy
- Three
- three accesses & two platforms
- three affliction
- Three-Age System
- Three Antis Movement and Five Antis Movement
- three-arc illusion
- three-area nine-region pulse-taking method
- three awards and one subsidy
- three-axial ellipsoid
- three-axis coordinate system
- Three axis handheld stabilizer
- three axis magnetic logging device
- three axis magnetometer
- three-axis mount
- three-axis mounting
- three-axis stabilized attitude control system
- three-axis stabilized control
- three-axis stabilized platform
- three basic critical temperature
- three basic requirements for the formation of molecular orbital
- Three Battles and Three Victories Cliffside Inscriptions at Dayunshan
- three bearing deflection thrust vector
- three bearing swivel nozzle
- three benevolences of the Yin dynasty