When you put a metal key into its metal lock, you find the key is too – McqOptions

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1.	When you put a metal key into its metal lock, you find the key is too tight. Which of the following methods will you adopt to make the key fit properly?
A.	Heating the key and lock both
B.	Cooling the key and heating the lock
C.	Heating the key and cooling the lock
D.	Cooling the key and lock both
Answer» C. Heating the key and cooling the lock

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