首页
登录
职称英语
For centuries men dreamed of achieving vertical flight. In 400 A.D. Chinese
For centuries men dreamed of achieving vertical flight. In 400 A.D. Chinese
游客
2023-08-21
51
管理
问题
For centuries men dreamed of achieving vertical flight. In 400 A.D. Chinese children played with a fan-like toy that spun upwards and fell back to earth as rotation ceased. Leonardo da Vinci con ceive the first mechanical【B1】______,called a "Helix," which could carry man straight up, but was only a design and was never tested.
The ancient-dream was finally realized in 1940 when a Russian engineer piloted a strange look ing craft of steel tubing with a rotating fan【B2】______.It rose awkwardly and verti cally into the air from a standing start,hovered a few feet above the ground,went【B3】______and backwards, and then settled back to earth. The vehicle was called a helicopter.
Imaginations were fired. Men dreamed of going to work in their own personal helicopters. Peo ple anticipated that vertical flight transports would carry millions of passengers as do the airliners of today. Such fantastic expectations were not【B4】______.
The helicopter has now become an extremely useful machine. It【B5】______in military missions, carrying troops, guns and【B6】______ instruments where other air craft cannot go. Corporations use them as airborne offices, many metropolitan areas use them in po lice work, construction and logging companies employ them in various【B7】______ways, engineers use them for site selection and surveying, and oil companies use them as the best way to make offshore and remote work stations【B8】______crews and supplies. Any urgent mission toa hard-to-get-to placeisa likely task for a helicopter.Among their other【B9】______of use:deliver people across town,fly to and from airports,【B10】______ rescue work, and aid in the search for missing or wanted persons. [br] 【B3】
选项
答案
sideways
解析
空格后的and提示此处应填入表方位的副词,与backwards构成并列关系。sideways意为“斜向一边”。
转载请注明原文地址:https://tihaiku.com/zcyy/2945780.html
相关试题推荐
Forcenturies,farmershaveusedwindmillstopumpwater,crushgrainandpe
Forcenturies,farmershaveusedwindmillstopumpwater,crushgrainandpe
Forcenturies,farmershaveusedwindmillstopumpwater,crushgrainandpe
Forcenturies,farmershaveusedwindmillstopumpwater,crushgrainandpe
Forcenturies,farmershaveusedwindmillstopumpwater,crushgrainandpe
Forcenturies,farmershaveusedwindmillstopumpwater,crushgrainandpe
Forcenturies,farmershaveusedwindmillstopumpwater,crushgrainandpe
Forcenturies,farmershaveusedwindmillstopumpwater,crushgrainandpe
Forcenturies,farmershaveusedwindmillstopumpwater,crushgrainandpe
Forcenturies,farmershaveusedwindmillstopumpwater,crushgrainandpe
随机试题
ThenativepeopleofNorthandSouthAmericaweregiventhename"Indians"b
ThoughtsofsuicidehauntedAnitaRutnamlongbeforeshearrivedatSyracuse
下列可促进铁吸收的是A.维生素E B.维生素D C.维生素B D.维生素A
A.氨基醚类抗过敏药 B.哌啶类抗过敏药 C.丙胺类抗过敏药 D.乙二胺类
关于精益生产模式下推进式企业生产物流管理模式特点的说法,正确的是()。A
我国《人民防空法》规定,人民防空实行()方针。A.人防建设与城市建设相结合
房地产投资的()使投资者要求的最低收益率并不是通货膨胀率与行业基准折现率的直接加
依据《食品安全法》的规定,下列选项正确的是哪一项?A.禁止将有毒农药用于蔬菜、瓜
A.(3.0~12.0)×10/L B.(4.0~10.0)×10/L C.
B慢性肾功能不全继发性甲旁亢患者应给予 A.糖皮质激素 B.磷结合剂 C
最新回复
(
0
)