Aircraft flying in …….. arcs create microgravity for tests and simulations that last 20-25seconds.
A. circular
B. parabolic
C. straight
D. oval
Giải bởi Vietjack
Đáp án: D
Giải thích: Máy bay bay trong vòng cung hình bầu dục tạo ra trọng lực cho các thử nghiệm và mô phỏng kéo dài 20-25 giây.
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