9. Space-faring nations are well aware of the dangers caused by space — 9 —from inactive satellites to discarded rocket stages to nuts and bolts left in orbit. (A) shuttles (B) debris (C) inertia (D) alluvia

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詳解 提供者:Fang Jiun Wang
B (A)班車(B)的碎片(C)慣性(D)沖積