: The sound which cannot be heard pleasantly is called noise. R: The sound above 80 dB becomes painful. (1m)
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Both A and R are true and R is the correct explanation of A.
Both A and R are true but R is not the correct explanation of A.
A is true but R is false.
A is false but R is true.
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Both A and R are true but R Is not the correct explanation of A
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