磕舞差=根號(70平方-21.5/2平方)-70=0.8寸
* 1800R的屏幕到眼睛的距離=70寸。
**27寸屏幕寬度=21.5寸
* 1800R的屏幕到眼睛的距離=70寸。
**27寸屏幕寬度=21.5寸
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