“21-centimeter line”的概念、定义、翻译、参考文献-科学参考

单词	21-centimeter line
释义	21-centimeter line [¦twen·tē¦wǝn `sen·tǝ´mēd·ǝr ´līn] ^SPECTROSCOPY A radio-frequency spectral line of neutral atomic hydrogen at a wavelength of approximately 21 centimeters and a frequency of approximately 1420 megahertz, that results from hyperfine transitions between states in which the spins of the electron and proton are parallel and antiparallel.
随便看	nogalamycin no-go gage no-hair theorems noil noise noise analysis noise analyzer noise-canceling microphone noise control noise digit noise distortion noise equivalent temperature difference noise factor noise figure noise filter noise generator noise grade noise immission level noise improvement factor noise jammer noise killer noiseless channel noise level noise limiter noise measurement

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