首页
登录
职称英语
[originaltext] The helicopter can fly forwards, backwards, up, down, and sid
[originaltext] The helicopter can fly forwards, backwards, up, down, and sid
游客
2024-06-08
17
管理
问题
The helicopter can fly forwards, backwards, up, down, and sideways. It can also hover in the air. It needs no runway to operate from. It can land and take off from a flat roof-or a clearing in the jungle.
The main disadvantage of the helicopter is that it cannot fly as fast as most planes. It is also often noisy. Helicopters are widely used by the armed forces. They are also useful for sea and mountain rescue operations. In some cities they are used for regular passenger flights.
The helicopter is different from an aeroplane which gets its lift from fixed wings, and its thrust from a propeller or a jet. Instead of wings, the helicopter has a many-bladed rotor on its top. This is driven by the engine. The rotor blades are, however, the same shape as wings and they provide lift for the helicopter when they turn. The spinning rotor also propels the helicopter. The helicopter pilot maneuvers his craft by altering the angle of the rotor blades.
As the turning of the rotor tends to make the body of the helicopter turn as well, most helicopters have a small rotor on their tail.
选项
A、The Helicopter.
B、The Advantages of the Helicopter.
C、The Disadvantages of the Helicopter.
D、The Uses of the Helicopter.
答案
A
解析
主旨概括题 本文的谈论重点就是直升飞机的优缺点及其组成部分。
转载请注明原文地址:https://tihaiku.com/zcyy/3624419.html
相关试题推荐
[originaltext]Iamoneofthemanycitypeoplewhoarealwayssayingthatg
[originaltext]Oneofthefirstquestionsanybodymayaskaboutanew-borni
[originaltext]Oneofthefirstquestionsanybodymayaskaboutanew-borni
[originaltext]W:Couldyoutellmeabitaboutwhyyouwantedtobeadoctoran
[originaltext]W:Couldyoutellmeabitaboutwhyyouwantedtobeadoctoran
[originaltext]M:Pleasetakeaseat,andwecanhavealittlerestbeforethel
[originaltext]M:Pleasetakeaseat,andwecanhavealittlerestbeforethel
[originaltext]M:Pleasetakeaseat,andwecanhavealittlerestbeforethel
[originaltext]M:Pleasetakeaseat,andwecanhavealittlerestbeforethel
[originaltext]M:Pleasetakeaseat,andwecanhavealittlerestbeforethel
随机试题
It’ssaidthemostexcitingkindofeducationisalsothemostpersonal.No
Hethoughtthatsocialismwasthemostimportantcausetowhichhecould______h
WorkingtoImprovetheConditionsofEvergladesNationalParkA)Whenma
Whentoday’scollegegraduatesgettogetherforareunionsomeday,theymay
[originaltext] Foreverywomanwhofeelslikeshe’shadtogiveupherpersona
TheMarriageContractAmarriageisacontract.You
【C1】[br]【C19】A、despiteB、viaC、exceptD、withoutA介词辨析题。本句的意思是:格莱格斯认为这是"我们持久的挑战
Worriedaboutprescriptiondrugs?Howtoweighyourrisk?[A]Wh
体育竞技掺入越来越多的经济利益,会驱使一些人走向极端。虽然目前运动员的自然能力仍
下列技术创新决策的评估方法中,()克服了单独使用一种指标对项目优先权排序的缺
最新回复
(
0
)