举一反三
- The transmission media used by 10BASE-T Ethernet is ( ) A: Twisted pair B: Fiber C: Coaxial cable D: Radio waves
- The transmission media used by 10BASE-F Ethernet is ( ) A: Fiber B: Twisted pair C: Coaxial cable D: Radio waves
- adio communication A: to control the function of something B: a message sent through radio waves
- According to the passage, scientists used to think that the X-rays were produced by ______. A: making sparks in laboratory B: discharges of high-energy electron in the Sun, in exploding stars, and in lightning C: electrons escaping their normal connections D: radio waves
- Simile is used in the sentence “The waves were mountain high.”
内容
- 0
It is possible to use satellites to predict earthquakes because satellites ________. A: take pictures of the Earth B: catch radio waves sent from the Earth’s surface C: are sensitive to Earth’s movements D: see almost the entire Earth
- 1
The British people are used to _________.
- 2
13. How are paired NBDP frequencies normally used? . A: These are normally used for FEC conunurucations with coast radio stations. B: These are normally used for ARQ communications with coast radio stations. C: These are normally used only for distress communications to limit channel interference. D: These are normally used for DSC communications with coast radio stations.
- 3
When these electromagnetic waves escape from the conductor into space, they are said to be radiated by the conductor, hence the name radio waves.
- 4
When you call a friend in Puerto Rico, the radio waves from your cell phone first travel to ________.