OG详解-OG3 数学1 Q22

Choice A is correct. It’s given that the sample is in the shape of a cube  with edge lengths of 0.9 meters. Therefore, the volume of the sample is 0.903, or 0.729, cubic meters. It’s also given that the sample has a density of 807 kilograms per 1 cubic meter. Therefore, the mass of this sample is  0.729 cubic meters(807 kilometers1 cubit meter​​) , or 588.303 kilograms. Rounding this mass to the nearest whole number gives 588 kilograms. Therefore, to the nearest whole number, the mass, in kilograms, of this sample is 588.
Choice B is incorrect and may result from conceptual or calculation errors. 
Choice C is incorrect and may result from conceptual or calculation errors. 
Choice D is incorrect and may result from conceptual or calculation errors.