Question

bridges are mounted on rollers​

Answer 1

Answer:

iron bridges are mounted on steel rollers because it expand on heating and contract on cooling.so ,leaving a small space in between for the expansion and contraction. Thus ,the bridge is saved from collapse.

Answer 2

Answer:

iron bridges are mounted on steel rollers because it expand on heating and contract on cooling.so ,leaving a small space in between for the expansion and contraction. Thus ,the bridge is saved from collapse

Explanation:

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