Microwave communication uses high-frequency(56)waves that travel in straightlines through
Microwave communication uses high-frequency(56)waves that travel in straightlines through the air. Because the waves cannot(57)with the curvature of the earth, they can be(58)only over short distance. Thus, microwave is a good(59)for sending data between buildings in a city or on a large college campus. For longer distances, the waves must be relayed by means of "dishes" or(60).These can be installed on towers, high buildings, and mountain tops.
A.optical
B.radio
C.electrical
D.magnetic
wasitinApril,1970chinasucceededsendingitsfirstsat 英语 2020-04-26 …
Who in the hell is that?In the hell 怎么用,而且为什么要这样来 英语 2020-05-13 …
what was it that made you decide to choose this c 英语 2020-05-14 …
The apples in my basket are bigger than __{that} 英语 2020-05-14 …
分析句子各个用逗号隔开的部分在句中成分,To be specific,the number of 英语 2020-05-14 …
who's that in the picture?( ) A It's me B that's 英语 2020-05-16 …
__has happend is that in the past three years gre 英语 2020-05-16 …
I like to live in a room with the w___ face to th 英语 2020-05-16 …
It is well known to us all that in china traffic 英语 2020-05-16 …
几个看不懂结构的英语句子1.Your brain sends chemicals around y 英语 2020-05-17 …