It was the apple, x0 and I call that position x zero.
原来是苹果的位置，记作。
Move with the X axis micrometric movement the sharp shadow, till the digital comparator red light is on the zero right position.
微调移动X轴接近“十”字比较尺，直到数字比较器的指示灯在零点右边变亮。
Move with the X axis micrometric movement the sharp shadow, till the digital comparator red light is on the zero right position.
微调移动X轴接近“十”字比较尺，直到数字比较器的指示灯在零点右边变亮。
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