更多"It flies in the sky."的相关试题:
[填空题]It flies in the sky.
[填空题]Patterns of Adh gene of flies living at different latitudes can help scientists to see ______.
[单项选择]When an airplane flies too high,（）
A. the air will be too thin to support its wings
B. the air will become thicker
C. the air will exert pressure on it
D. the air will disappear in no time
[填空题]Bush flies are easier to control than buffalo flies.
[简答题]Continuing into the West, the plane flies over vast prairies and rough cattle-grazing country
[单项选择]Jack: How time flies! Another Friday again Susan: Oh, yes. I haven’t realized that. Jack: Do you have any plans for this Saturday afternoon Susan: ______ Why Jack: I’m wondering if you’d like to go to a movie with me. Susan: I’m afraid we’ll have to change the date.
A. I am free for the whole day.
B. I don’t have any plans.
C. I have a prior engagement at three.
D. I’m not quite sure for the moment.
[填空题]
An airplane flies because its wings push down on the air
flowing past them, and in reaction, the air pushes up on the wings. When an
airplane is level or rising, the front edges of its wings ride higher than the
rear edges. The angle the wings make with the horizontal is called the angle of
attack. As the wings move through the air, this angle causes them to push air
flowing under them downward. A sleeper angle of attack will cause the wings to
push more air downward. The third law of motion voiced by English physicist
Isaac Newton states that every action produces an equal and opposite reaction.
In this case, the wings pushing air downward is the action, and the air pushing
the wings upward is the reaction. This causes lift, the upward force on the
plane, Lift is often explained using Bernoulli’s principle, which states that,
in some circumstances, a faster moving fluid(流体) (such as air)will have a lower
pressure than a slower moving fluid. The ai
