读“大气温室效应示意图”,回答下列问题。 (1)A表示_______辐射。 (2

题型:综合

问题:

读“大气温室效应示意图”,回答下列问题。

(1)A表示_______辐射。

(2)B表示_______辐射,易被大气中的_______和_______等吸收,使大气增温,因此_______是对流层

    大气的直接热源。

(3)C表示_______辐射,它补偿了地面辐射损失的热量,因此对地面起到了保温作用。

考点:大气的受热过程
题型:综合

机械加工精度包括哪些?获得的方法是什么?

题型:综合

请阅读下面一篇文章,并按照要求匹配信息。

     Do you know Australia? Australia is the largest island in the world. It is a little smaller than China. It is

in the south of the earth. __1__The population of Australia is nearly as large as that of Shanghai.__2__The cities in Australia have got little air or water pollution. The sky is blue and the water is clean. You can

clearly see fish swimming in the rivers. Plants grow very well.

     Last month we visited Perth, the biggest city in western Australia, and went to a wild flowers' exhibition.__3__We had a wonderful time. Perth is famous for its beautiful wild flowers. In spring every year Perth

has the wild flowers' exhibition.

     After visiting Perth, we spent the day in the countryside. We sat down and had a rest near a path at the foot of a hill. It was quiet and we enjoyed ourselves. Suddenly we heard bells ringing at the top of the hill.

__4__ There were about three hundred sheep coming towards us down the path. __5__After a short

drive from any town, you will find yourself in the middle of white sheep. Sheep, sheep, everywhere are

sheep.

A. The government has made enough laws to fight pollution.

B. Australia is the sixth largest country in the world.

C. Australia is famous for its sheep and kangaroos.

D. Australia is big, but its population is not large.

E. What we saw made us pick up all our things and run back to the car as quickly as we could.

F. There we saw a large number of wild flowers we had never seen before.

G. The people of Australia are very hardworking.

题型:综合

       1816年以后的十年间,圣马丁率领起义军横扫西班牙军队,解放了西班牙在南美的殖民地,被誉为“南美的解放者”。1857—1859年印度爆发了声势浩大的民族大起义,贞德是这次起义的杰出女英雄。

错误:                                                                                                                          

订正:                                                                                                                          

错误:                                                                                                                          

订正:                                                                                                                          

题型:综合

吞吐量是指计划期内()库物资的总量。

题型:综合

在计算机网络中,实现数字信号和模拟信号之间转换的设备是 【11】 

更多题库