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【单选题】
一宇航员要到离地球为 5 光年的星球去旅行.如果宇航员希望把这路程缩短为 3 光年,则他所乘的火箭相对于地球的速度A.
v = (1/2) c
B.
v = (9/10) c
C.
v = (3/5) c
D.
v = (4/5) c
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