A: wrong.
B: wrong.
C: wrong.
D: This is the right answer.
举一反三
- A filter that attenuates high frequencies while passing low frequencies is called a（ ）. A: bandpass B: bandstop C: lowpass D: highpass
- 3. The common mode rejection ratio (CMRR) is the ratio of ________. A) the difference mode gain to the common mode gain B) the common mode gain to the difference mode gain C) noninverting gain to inverting gain D) inverting gain to noninverting gain A: This is the right answer. B: wrong. C: wrong. D: wrong.
- The sum of the relative frequencies for all classes will always equal:
- Which of the following is not coherent? A: “I’m wrong,” she said to my sister. B: She told my sister that she was wrong. C: “You’re wrong,” she said to my sister. D: My sister was told that she was wrong.
- The sum of frequencies for all classes will always equal 1. (<br/>)
内容
- 0
. 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
- 1
An open pipe of air supports standing waves at frequencies of 300 Hz and 400 Hz. There are no other frequencies between these two. What is the frequency of the second harmonic of this tube? A: 100 Hz B: 200 Hz C: 400 Hz D: 600 Hz
- 2
What was one problem identified with the high-band frequency? A: High-band waves give off high levels of radiation. B: High-band waves are easily blocked by barriers. C: The high-band spectrum is very costly to operate. D: High-band frequencies require more electricity.
- 3
Mr. White didn't know he was in the wrong train. A: Right. B: Wrong. C: Doesn't say.
- 4
Which of the following frequencies are not DSC distress and safety frequency? A: 2187.5kHz. 4207.5kHz B: . 6312kHz. 8414.5kHz C: 2182kHz. 829lkHz D: 12577kHz.16804.5kHz