When a symmetrical light spot is equally incident on all the quadrants, the device generates four equal currents and the spot is said to be located on the device's electrical center.
当一束对称的光点均等地入射到所有象限，该装置会产生的四股相等的电流，而这个光点就会被认为处在该设备的电中心。
When a symmetrical light spot is equally incident on all the quadrants, the device generates four equal currents and the spot is said to be located on the device's electrical center.
当一束对称的光点均等地入射到所有象限，该装置会产生的四股相等的电流，而这个光点就会被认为处在该设备的电中心。
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