- Primary standard substance?

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What is DAESH? Rationalize the numerator [sqrt(x) - sqrt(x+h)] / [h sqrt(x) sqrt(x+h)]? What is true about the potential energy of an object moving in SHM? Two red blood cells each have a mass of 9.05*10^-14 kg and carry a negative charge spread uniformly over their surfaces.? What is the answer of twice the diffence of 738 and 280 added to the quotient of 2466 and 9 is?