Why is it important that lift be equal on both sides of the helicopter shaft

Câu hỏi :

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 38 to 42.

A. If there is more lift on one side, the helicopter will flip.

B. Equal lift means that the helicopter will be faster.

C. Dissymmetry of lift makes helicopters fly well.

D. It allows the rotor blade angles to be changed.

* Đáp án

B

* Hướng dẫn giải

Đáp án B


Đáp án nằm ở dòng 3, 4 và 5 đoạn 2: “Uneven lift, known as dissymmetry, caused the early helicopters to flip over and confounded the inventors until the creation of the swash-plate; this allowed the rotor blade angles to be changed so that lift would be equal on each side of the shaft.”

Câu hỏi trên thuộc đề trắc nghiệm dưới đây !

20 Đề thi thử THPTQG môn Tiếng Anh cực hay có đáp án !!

Số câu hỏi: 1000

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