关于资源块RB，下列说法正确的是（）。
A、一个资源块RB频域上固定为180KHz，固定为12个15kHz的子载波，时域上为0.5ms，即一个时隙；
B、一个资源块RB频域上固定为180KHz，固定为12个15kHz的子载波，时域上为1ms，即一个子帧；
C、一个资源块RB频域上固定为180KHz，可以是12个15kHz的子载波也可以是24个7.5kHz子载波，时域上为0.5ms，即一个时隙；
D、一个资源块RB频域上固定为180KHz，可以是12个15kHz的子载波也可以是24个7.5kHz子载波，时域上为1ms，即一个子帧。
参考答案：C
| 用方框中所给的词完成短文。 | |
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