问题描述：
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宇宙飞船在一颗直径2 .2千米,平均密度2 .2克/立方厘米的小行星上着陆,这颗小行星在缓慢的自转,宇航员决定用2 .2小时的时间沿着这颗小行星的赤道走一圈,他们的这种想法是否能够实现？A spaceship landed on an asteroid 2 .2 km in diameter with an average density of 2 .2g/cm3 . The asteroid is slowly rotating. The cosmonauts decided to travel along the equator of the asteroid in a rover in 2 .2 hours. Will it be possible for them to do such a thing
A．能
B．不能
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上一篇：太阳的视差为πs = 8". 8 ,具有相同绝对星等的另一颗恒星的视差为π* = 0" .022 ,在晚上能否用肉眼看到这颗星？The sun has a parallax of πs = 8 " .8 , and a star with the same absolute brightness π* =0 " .022 . Is it possible to observe the star at night sky visually
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