What is revised category ratio scale? Please put in easy words

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p-o;ki,ljh tgfcx

replace   c   with   a   and simplify.

a = c , b = a, q = n , 2 , a = c , 900 b= a , 700 , q = n , 600 , 2 = b o t h , b = a , q = n

answer is d. graphite coatings.

some connecting rods have _graphite coatings_ to lubricate the cylinder wall or piston pin.