working plane meaning in English

工作横向剖面
工作面
工作平面

Lighting in which the light on the working plane or on an object is not incident predominantly from a particular direction
工作面或被照物体上不存在明显来自于从某一特定方向上的光线的照明方式。
Of an interior lighting installation . the ratio of the direct flux on the working plane to the downward flux of the installation
在室内照明系统中，工作面上的直射光通与系统所有向下辐射的光通之比。
Lighting by means of luminaires with a light distribution such that 90 to 100 per cent of the emitted luminous flux reaches the working plane direct , assuming that this plane is unbounded
在假定为面积无限大的平面上，有90 %至100 %的辐射光通以直射的方式到达该平面的照明方式。
Ratio of the average illuminance on the working plane after a specified period of use of a lighting installation to the average illuminance obtained under the same conditions for a new installation
照明装置使用一定时间后工作面上的平均照度，与通常认作是新照明装置在相同条件下得到的平均照度之比。
Lighting by means of luminaires with a light distribution such that not more than 10 per cent of the emitted luminous flux reaches the working plane direct , assuming that this plane is unbounded
采用具有一定配光曲线的灯具进行照明，在不考虑工作面边界时使得直接到达工作面的光通不超过总光通的10 %的照明方式。