本题目来源于试卷: Overweight and underweight，类别为 美国物理杯赛(Physics Bowl)
[单选题]
00.12: Astronauts inl20 mq.;i1b 5mbfxpn k an ovmk r v6.0bx+su4.4w dgw8bur rbiting space shuttle are “weightless” because
A. of their extreme distance from the earth
B. the net gravitational force on them is zero
C. there is no atmosphere in space
D. the space shuttle does not rotate
E. they are in a state of free fall
参考答案: E
本题详细解析:
暂无
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