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如图1所示,要测量L尺寸,因为R′母线较长,所以无法用投影法测量。在仪器上用接触法测量亦很困难。我们采用了以下平台测量法,使问题得到解决。
As shown in Figure 1, to measure the L size, because R ’bus is longer, it can not be measured by projection method. It is also difficult to measure with the contact method on the instrument. We used the following platform measurement to solve the problem.