轻便凿岩机

mouse, joystick, touch pad, touch panel, touch screen,light pen, digitizer tablet

coefficient of light absorption【环境】

extra light calcined magnesia

light intensity

reflected light

active matrix organic light emitting diode，AMOLED

central light loss, CLL

airglow【地物】;light-of-the-night-sky【地物】;permanent aurora【地物】