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44. A planet has the same mass as the Earth. It also has a radius twice the Earth’s radius. If the Earth’s acceleration due to gravity is g, what is the acceleration due to gravity on the planet’s surface?
(A) 1/4 g
(B) 1/2 g
(C) g
(D) 2 g

答案：A
難度： 困難


44. A planet has the same mass as the Ea..-阿摩線上測驗