... 在野外，SPAD502使用非常便捷。SPAD的测量面积只有2mm 六、如何使用深度滑块（THE DEPTH STOP） 设置滑块位置，将叶片卡在它的两边，然后移动滑块，滑块可从中心线最远移动6mm。 ...
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The f-stop, otherwise known as the aperture, determines your depth of field (the area in focus) and how much light can pass through the lens to reach the sensor.
f制光圈(或称光圈)决定相机的景深(对焦区域)以及有多少光能通过镜头到达传感器。
The two types of short cracks stop propagating on reaching some depth.
两种短裂纹长大到一定深度时均停止扩展。
It's available to stop adding polymer mud after drilling to the designed hole depth of 3-5m.
在钻孔至将近设计孔深3 - 5米时，可停止添加聚合物泥浆。
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