数字波形合成
digital waveform synthesize
digital waveform synthesis
直接数字波形合成
direct digital waveform synthesis
direct digital waveform synthesizer
DDWS
direct digital frequency synthesizer
光分波合波器
optical couplers， WDM， dual-wavelength
optical couplers
WDM
Dual-wavelength
其他光分波合波器
Other Optical WDM Couplers
十字形焊缝
cross-shaped welding seam
不对称十字形截面异形柱
asymmetrical cross-shape section column