已知值 meaning in English

give value
given value
known value

The attribute and known values do not match
该属性和已知值不匹配。
The attribute and known values match
该属性和已知值匹配。
That is , the column is considered to not exist at all instead of merely not having a value
该类用于指示不存在某个已知值（通常在数据库应用程序中）。
Control , this property enables you to access that control through a known value that you set in advance
控件始终执行某个编程操作，使用此属性即可通过预先设置的已知值来访问该控件。
Using the time taken for each individual pulse to be returned and the known value of the speed of light the system can automatically calculate the distance of the feature from the vehicle
使用时间为每个脉冲产生与已知值的光速该系统能自动计算距离的特点,从车上下来

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