drawing
(1)抽，拉，压延
(2)牵引
(3)提取
(4)回火
(5)绘图

• luminous reflectance
• luminous-reflection factor
• luminous reflectivity
• luminous sensitivity threshold
• luminous sensitivy
• luminous spot
• luminous-spot voltmeter
• luminous standard lamp
• luminous surface
• luminous surface absorptivity
• luminous transmittance
• Lummer-brodhum cube
• Lummer-Brodhum phtometer
• Lummer-Gehrcke interferometer
• lummer-Gehrcke plate
• lump
• lumped capacity
• lumped electric filter
• lumped element
• lumped modulator
• lunar camera
• lunar laser
• lunar laser ranging
• lunar otpical altimeter
• lunar rate