结合前文“Airplanes can fly because of air. The invisible air moving under their wings is strong enough to hold them up.(飞机能飞是因为有空气。在它们翅膀下移动的看不见的空气足够强大,足以支撑它们)”可知,飞机起飞需要空气,而火箭起飞则不需要周围有空气将其抬起。故选D项。 (11)题详解: 考查...
阅读下面短文,从每题所给的 A、B、 C、D四个选项中选出可以填入空白处的最佳选项。Airplanes can fly because of air. The A
Airplanes can fly because of air. The___air moving under their wings is strong enough to hold them up. The wing is___on top while the bottom is flat. When engines___the wing forward, the air molecules (分子) on top are a little farther___. This makes the air there thinner, whic...
Sashen943/Fly-Away Star10 Code Issues Pull requests An android application that keeps track of all your flights roomtravelflightairplaneslivedata UpdatedJul 20, 2019 Java a simple tool which changes your ip address if you use mobile data. ...
they fly,they need to check the weather as well as the flight (飞行) plans on their computers.In the air,pilots watch all the plane's systems.They also (2)t alk with people on the ground by the radio. Some pilots learn to fly airplanes in the army.Some...
Airplanes can be___ by computers. 相关知识点: 试题来源: 解析 flown 将原句“Computers can fly into the air.” 改为被动语态,需要将动词“fly”变为被动形式“flown”。 因此,改写后的句子为:Airplanes can be flown by computers. 答案:flown反馈...
Of course, movies about air travel naturally lend themselves to suspense — like "Flightplan" or "United 93" — mostly because the idea of being in a crisis in the air automatically makes for good drama. The stakes couldn't be higher and the air can't be thinner. Then there are strai...
aYou use this to make cheese ang you can drink it,too 您使用此做您能喝它的乳酪ang,也是[translate] a.is the sky full of air?we know that there is air around the world.we could not breathe without air.airplanes could not fly without air.they need air to lift their wings. .is充分天...
B. Less power they can also run out of the runway because the air is too thin." "As air warms C. More speed. D. More fuel.up. there are fewer molecules(分子) to be under your wings," he added. "With30. What do airlines do to make planes fly safely?less lift, you need ...
1. Why do airplanes take longer to fly west than east? It can take five hours to go west-east from New York (NY) to London but seven hours to travel east-west from London to NY. The reason for the difference is an atmospheric phenomenon (大气现象) known as the jet stream (气流)....