--- Kitty, do you know ______?

---Sure, about forty minutes.

A．when did their class meeting begin.

B．where their class meeting was held

C．how often their class meeting is held

D．how long their class meeting will last

影响小区平均吞吐率的因素（）

A.系统带宽：系统的不同带宽决定了系统的总RB数

B.数据信道可用带宽：公共信道的开销进一步决定了用户可以实际使用的资源，其中下行主要包括PDCCH和系统消息，上行主要包括PUCCH、SRS、PRACH

C.邻区负载：DL/UL负载直接影响本小区平吞吐率

D.本小区负载：直接影响本小区可使用的RB数