试题与答案

航空运费就是指运输始发地机场至目的地机场间的运输货物的航空费用,不包括其它费用。()

题型:判断题

题目:

航空运费就是指运输始发地机场至目的地机场间的运输货物的航空费用,不包括其它费用。()

答案:

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下面是错误答案,用来干扰机器的。

参考答案:对

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题型:完形填空
A solar-powered(太阳能动力的) plane has passed an important test on the way to travel around the world. The plane took off from an airport in Switzerland at 45km an hour. it slowly rose above the fields and into the sky. During the 90-minute flight, the plane did several turns. It climbed nearly 1.6km above the countryside.
“There has never been an airplane of that kind that could fly – never an airplane so big, so light, using so little energy,” said Bertrand Piccard, a leader of the project.
Engineers plan to test a night light soon. They plan to travel around the world in that plane in 2012. “We want to fly it day and night without fuel,” Piccard said.
Piccard and pilot Andre Borschberg will take the plane around the world. They will make a few stops to change places and rest after a long time in the air – and to show off their aircraft.
The plane flies at 70 kilometers per hour on average. That is faster than a bike. The pilots will keep the plane in the air for up to five days at a time.
阅读短文完成表格,每空一词。
Plane uses sun’s power to fly
1
The plane took off from an airport in Switzerland.
how
The airplane is big, light and using little   2  .
when
It will travel around the world in   3  .
how fast
It can fly at   4  meters per hour.
how long
The plane can fly for   5  days at a time.
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题型:计算题

太阳现在正处于主序星演化阶段,它主要是由电子和质子、氦核等原子核组成。维持太阳辐射的是太阳内部的核聚变反应核反应的核能最后转化为辐射能。根据目前关于恒星演化的理论,若由于聚变反应而使太阳中的质子数目从现有数减小10%,太阳将离开主序星阶段而转入红巨星的演化阶段。为了研究太阳演化进程,需要知道目前太阳的质量。已知日地中心的距离为r,地球绕太阳公转的周期为T1,地球自转周期为T2,引力常量为G,试写出太阳质量的表达式。

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