首页
财务会计
医药卫生
金融经济
考公考编
外语考试
学历提升
职称考试
建筑工程
IT考试
其他
登录
职称考试
下面有 3 篇短文,每篇短文后有 5 道题。请根据短文内容,为每题确定 1 个最佳选项。 The Hyper-X The Hyper-X (超...
下面有 3 篇短文,每篇短文后有 5 道题。请根据短文内容,为每题确定 1 个最佳选项。 The Hyper-X The Hyper-X (超...
admin
2020-12-24
29
问题
下面有 3 篇短文,每篇短文后有 5 道题。请根据短文内容,为每题确定 1 个最佳选项。
The Hyper-X
The Hyper-X (超音速飞机)recently broke the record for air-breathing jet planes when it traveled at a Hypersonic speed (超音速) of seven times the speed of sound. That’s about 5,000 miles per hour. At this speed, you’d get around the world — flying along the equator
(赤道)-in less than 5 hours.
The Hyper-X is an unmanned, experimental aircraft just 12 feet long. It achieves hypersonic speed using a special sort of engine known as a scramjet (超音速冲压式喷气发动机).
For an engine to burn fuel and produce energy, it needs oxygen. A jet engine, like those on passenger airplanes, gets oxygen from the air. A rocket engine typically goes faster but has to carry its own supply of oxygen. A scramjet engine goes as fast as a rocket, but it doesn’t have to carry its own oxygen supply.
A scramjefs special design allows it to obtain oxygen from the air that flows through the engine. And it does so without letting the fast-moving air put out the combustion flames. However, a scramjet engine works properly only at speeds greater than five times the speed of sound.
A booster rocket (助推火箭)carried the Hyper_X to an altitude of about 100,000 feet for its test flight. The aircrafts record-beating flight lasted just 11 seconds. That brief journey on March27 makes a major milestone on the way to a new breed of very, fast airplanes, says Werner J. A. Dahm of the University of Michigan in Ann Arbor. In the future, engineers predict, airplanes equipped with scramjet engines could transport cargo quickly and cheaply to the briijilk (边缘)of space. Such hypersonic jets could carry passengers anywhere in the world in just a few hours.
Out of the three experimental Hyper-X aircrafts built for NASA, only one is now left. The agency has plans for another 11-second hypersonic flight,this time at 10 times the speed of sound.
What does Werner J. A. Dahm say about the Hyper-X test flight?
选项
A It was unsuccessful because it lasted only 11 seconds,
B It is a very important event in developing very fast airplanes,
C It allows people to fly at an altitude of 100,000 feet,
D It can transport cargo quickly and cheaply to outer space,
答案
B
解析
转载请注明原文地址:https://ti.zuoweng.com/ti/JbsQKKKQ
相关试题推荐
下面的短文有5处空白,短文后有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。 ADoctorintheHou...
下面的短文有5处空白,短文后有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。 ADoctorintheHou...
下面的短文有5处空白,短文后有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。
下面的短文有5处空白,短文后有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。
下面的短文有5处空白,短文后有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。
下面的短文后有2项测试任务:(1)第23~26题要求从所给的6个选项中为第1~4段每段选择1个最佳标题;(2)第27~30题要求从所给的6...
下面的短文后有2项测试任务:(1)第23~26题要求从所给的6个选项中为第1~4段每段选择1个最佳标题;(2)第27~30题要求从所给的6...
下面的短文后有2项测试任务:(1)第23~26题要求从所给的6个选项中为第1~4段每段选择1个最佳标题;(2)第27~30题要求从所给的6...
下面的短文后有2项测试任务:(1)第23~26题要求从所给的6个选项中为第1~4段每段选择1个最佳标题;(2)第27~30题要求从所给的6...
下面的短文有5处空白,短文后有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。 TheToughGrassth...
随机试题
某建筑施工公司现在有从业人员51人,对于其安全组织保障的说法,下列正确的是()。
有关胸椎描述正确的是 A.椎体小 B.似心形 C.锥孔较小 D.呈椭圆形
在短期借款利息的支付方法中,对加息法的正确表述是()。
患者经前或经期乳房胀痛,痛甚不可触衣,胸闷痰多,食少纳呆,平素带下量多,色白稠黏
下列哪项不是肺炎心力衰竭的诊断要点
常用于检测CIC的方法是
对钢筋混凝土梁斜截面受剪承载力计算的位置是下列中哪几个截面? Ⅰ.支座边缘处的
甲状腺大部切除术后喉上神经内支损伤的临床表现为A.饮水呛咳B.音调降低C.吞咽困难D.声音嘶哑E.呼吸困难
无机结合料施工过程中,如果下承层发现弹簧现象,可用()措施进行处理。A.晾晒B.换填C.掺石灰D.掺水泥E.重型碾压
应付冲应付是指用于处理供应商的预付款和对该供应商应付欠款的转账核销业务。