差动四通道伽玛射线能谱仪
differential four-channel gamma-ray spectrometer
单镜头四通道多光谱带照相机
single-lens four-channel multiband camera
电磁四通阀
solenoid operated 4-way valve
电动三位四通阀
electric three-potential four-way valve
二位四通阀
two-position four-way valve
热泵四通换向阀
heat pump four-way reversing valve
三位四通阀
three-position four-way valve
three-position four way valve
four-way valve with three-position
三位四通方向控制阀
three-position four way directional control valve
三位四通转阀
3-position 4-way disc valve