Aircraft flying in arcs create microgravity for tests and simulations that last 20-25 seconds.

Câu hỏi :

Aircraft flying in                     arcs create microgravity for tests and simulations that last 20-25 seconds.

A. straight

B. oval

C. circular

D. parabolic

* Đáp án

* Hướng dẫn giải

Chọn đáp án D

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