linear apodising screen
线性切趾屏

• ball and socket head
• ballast
• ballast resistance
• ballast resistor
• ballast tube
• ball bearing
• ballistic
• ballistic camera
• ballistic galvanometer
• ballistic intercontinental missile
• ballistic missile
• ballistic photography
• ballistic recording camera
• ballistic reticle
• ballistics
• ballistic type reticle
• Ball Lenses
• ball lightning
• ball mill pulverizer
• ball mirror
• balloon
• balloon-borne astronomical system
• balloon-borne infrared telescope
• balloon-borne telescope
• balloon theodolite