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This is the question on the attachment
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This is the question on the attachment

This is the question on the attachment-example-1
User Habib Zare
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Step-by-step explanation:

a) to allow for the metal tracks to expand on hot days.

reason:- as you have seen in summer the sunlight fall on these tracks and make the metal expand and fill that gaps.

hope this helps you

have a great day :)

User Beesleep
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