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13 votes
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This is the question on the attachment

This is the question on the attachment-example-1
User Burg
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1 Answer

5 votes
5 votes

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 Prasannatsm
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