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A concrete highway is built of slabs 20 m long (20°C). How w de should the expansion cracks between the slabs be (at 20°C) to prevent buckling if the range of temperature is -30°C to 55°C? Cm

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20 G w = 120)Co.ooooh) (50) 12.mr) . |(ผู้ใ가。s). 2 Crn

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