Backlight ( side surface ) tablets experimrnets uncalibration is the key point.

逆光 ( 侧逆光 ) 片三点定标的关键在于控制中点.

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Side surface should be flat and straight. Without burr, without rust.

端面平直,无毛刺. 无锈斑.

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The angle with beam perpendicular to one of the five side surface was defined as 0.

垂直于五个侧面之一的电子束的倾角,被定义为0.

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