The shape and structure of the bridge PPT-Textbook Science Six Courseware

Textbook Science 6 "Shape and Structure of Bridge" PPT If we are on this side of the river and want to go across the river, what are your options? Do you think there are any disadvantages? In ancient times, the most primitive and easiest way was to put a few stones in the middle of the river. In ancient times, the most primitive and easiest way was to put a few stones in the middle of the river.

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