It is applied that optic variable density disk which controlled by microcomputer and floating point amplifier technology in this device.
此装置采用单片机控制光学变密度盘，浮点放大器技术。
It is applied that optic variable density disk which controlled by microcomputer and floating point amplifier technology in this device.
此装置采用单片机控制光学变密度盘，浮点放大器技术。
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