We don't understand why, only at a specific depth, the detection of sunspots is easier.
我们还不知道为什么只在特定深度才能比较容易探测到黑子。
The present invention has the advantage that the measurement data of the diameter value of the inner bore with the bore gauge in specific depth is accurate due to high locating accuracy.
因为定位准确度高,用内径表测量内孔定深处直径值数据准确。
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