4.5 teachers give students notice the zero point position perpendicular to gravity between the base of the vertical location object. From Figure 2, and discuss together which should conclude that A picture of the object and image B horizontal lines remain in the base of the object. Best picture horizontal line C above outside vertical object in the database. It cannot be located in the vertical.
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![](//thimg.ilovetranslation.com/pic/loading_3.gif?v=b9814dd30c1d7c59_8619)