题目内容
（请给出正确答案）
Which flight takes you directly (直接地,马上) from Beijing to Moscow？
A．CA173.
B．CA907.
C．CA923.
简答题官方参考答案
（由简答题聘请的专业题库老师提供的解答）
更多“Which flight takes you directly （直接地,马上) from Beijing to Moscow？A．CA173.B．CA907.C．CA9”相关的问题
Which of the following sentences contains subjunctive mood？
A．Lucy insisted that her son get home before 5 o"clock.
B．She used to drive to work, but now she takes the city metro.
C．Walk straight ahead, and don"t turn till the second traffic lights.
D．Paul will cancel his flight if he cannot get his visa by Friday.
Before the flight takes off, all passengers are asked to (fast) ________ their seat belts.
During World War II the British used a practical application of this principle to detect German planes on their way to bomb London long before the enemy was near the target. They used radio waves instead of sound waves, since radio waves can penetrate fog and clouds. The outnumbered Royal Air Force(RAF) always seemed to the puzzled Germans to by lying in wait at the right time and never to be surprised. It was radio echoes more than anything else that won the Battle of Britain.
Since the radio waves were used to tell the direction in which to send the RAF planes and the distance to send them (their rage of flight, in other words) , the device was called "radio directing and ranging" , and from the initials the word "radar" was coined.
Sound waves reflected from a hill can be used to estimate the______.
A．height of the hill
B．speed of sound
C．distance to the hill
D．intensity of sound
A.administrator
B.prototype
C.counterpart
D.forerunner
Why is it not necessary to provide powered flight in space all the time？
A．Few spacecrafts complete their flight operations.
B．The Earth's gravity cannot be overcome.
C．No further power is needed after the escape speed is reached.
D．Free fall takes the place of the Earth's gravity pull.
A．The security check takes time
B．He has to check a lot of luggage
C．His flight is leaving in less than 2 hours．
D．The airport is a long way from the hotel．
警告：系统检测到您的账号存在安全风险
为了保护您的账号安全，请在“简答题”公众号进行验证，点击“官网服务”-“账号验证”后输入验证码“”完成验证，验证成功后方可继续查看答案！
