A: ) narrower range of frequencies.
B: ) broader range of frequencies.
C: ) range of frequencies equal to the pulse time.
举一反三
- Channel A: a word that indicates a response is not required B: a range of frequencies used by a particular station to transmit radio messages
- The sum of the relative frequencies for all classes will always equal:
- The sum of frequencies for all classes will always equal 1. (<br/>)
- What’s meaning of channel A: a word that indicates a response is not required B: a word that indicates a response is required C: a system in which words represent individual letters D: a range of frequencies used by a particular station to transmit radio messages
- 4. To fix the frequency boundaries of relatively high gain, 0.7 Amid was chosen to be at the cutoff levels. The corresponding frequencies, f1 and f2, are generally called ________. A) corner frequencies B) cutoff frequencies C) half-power frequencies D) All of the above A: wrong. B: wrong. C: wrong. D: This is the right answer.
内容
- 0
A filter that attenuates high frequencies while passing low frequencies is called a（ ）. A: bandpass B: bandstop C: lowpass D: highpass
- 1
. Which of the following frequencies is as international distress and safety frequencies on MF for radio telephone? A: 2187.5 kHz B: 2174.5 kHz C: 2182kHz D: 2177. OkHz
- 2
The difference between a histogram and a frequency polygon is: A: the frequency polygon is reported as a percent, a histogram does not report percents. B: the histogram shows frequencies while a frequency polygon shows cumulative frequencies. C: the bars in a histogram and a frequency polygon cannot be adjacent. D: open-ended classes can be accommodated with a frequency polygon.
- 3
中间区段，时间常数区段 intermediate range time constant range
- 4
中国大学MOOC: Recombination frequencies can be calculated by