A:月球第一宇宙速度为 4πRT
B:月球表面重力加速度为 8π2T2R
C:月球密度为 3πGT2
D:月球质量为 32π2R3GT2
-- Many students don't know what to stress and become worried.
-- I think they'd better ask their teachers for help.
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①酸雨 ②植树造林 ③温室效应 ④臭氧层破坏 ⑤围湖造田
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