নিচের কোনটি সত্য? (Which one of the followings is true?)
V 1 = P 0 ( t ° c + 273 273 )
P V T = W M R
D 1 P 1 T 1 = D 2 P 2 T 2
r 1 r 2 = √ d 1 d 2
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