⚫ （5），9，。XY，，。。9-51：（3）
⚫ Take the cross center line (straight line and coordinate axis passing point 5) as
the benchmark, measure the coordinate values of 9 points in turn and record.
The measurement method is that one side of the vernier caliper coincides with
the X-axis or Y-axis of the cross center line, and the other side coincides with
the point to be measured. At this time, the reading is the correction value. Or
use the quadratic element measurement. As shown in Figure 9-5, take the
correction value of point 1 as an example: (it can be considered that the
method of measuring for three times to take the average value, which will be
more accurate)
⚫ 4、5。2、3，4、5，。
⚫ Fill the measured values into columns 4 and 5 of the data table. In which, the
columns 2 and 3 are the set distances, and the columns 4 and 5 are the
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