瞬间通信
参考答案:
在大约2秒钟内实现通常需要较长时间才能完成的无线电通信。
阅读材料,回答下列问题。
材料一:长江中下游部分省市分布图(下图)
材料二:洞庭湖面积与容积的演变
(1)长江在A河段被称为_______,该河段特征是______________________、_____________________。
(2)洞庭湖面积变化的趋势足____,主要原因是________________、________________。
(3)洞庭湖是我国重要的湖泊湿地。洞庭湖面积的这种变化,会产生哪些不利影响?洞庭湖湿地生态环
境保护需注意哪些问题?
_________________________________________________________________________________________
选词填空。
rely on in other words be fed up with take place be likely to
pull out in consequence pull through on average go up
1.China's first lunar satellite be launched in April.
2.You can Peter to do whatever he promises.
3.Fire will if the gases hydrogen and oxygen are mixed and lighted.
4.National income would next year by 8.6 percent.
5.London has 7.6 hours of sunshine per day during May.
6.The patient eventually after having had a close brush with death.
7.The train at noon.
8.From now on you needn't work here .,you are fired.
9.There were no buses in the countryside; we had to walk.
10.He has eaten so many eggs since his childhood that he them now.