一个RB由若干个RE组成,频域宽度为『____』kHz,时间长度为『____』ms。(A RB is composed of severa

一个RB由若干个RE组成，频域宽度为『____』kHz，时间长度为『____』ms。(A RB is composed of several RE , and it's width is『____』kHz in the frequency domain , the length is『____』ms in the time domain. )