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75	75	**(1) The tested object is a white cylindrical tube made of PVC, with a height of 100cm and a diameter of 7.5cm.**
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	78	+[[image:image-20220610155021-2.png||height="377" width="1021"]]
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79		-[[image:1654852253176-749.png]]
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82	82	**(2)** **The object to be tested is a "corrugated cardboard box" perpendicular to the central axis of 0 °, and the length * width is 60cm * 50cm.**
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85		-[[image:1654852175653-550.png]](% style="display:none" %) ** **
	85	+[[image:1654852175653-550.png]]
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	87	+(% style="display:none" %) ** **
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89	89	== 1.5 ​ Applications ==
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91	91	* Horizontal distance measurement