What is a male baby horse called? A: A colt. B: A filly. C: A calf. D: A lamb.

“人生天地之间，若白驹过隙，忽然而已”出自庄周的《知北游》，形容时间过得极快。这句话可以翻译为（ ）。 A: Man's life between rich and poor is like a white colt's passing a crevice; it suddenly disappears B: Man's life between good and bad is like a white colt's passing a crevice; it suddenly disappears C: Man's life between heaven and earth is like a white colt's passing a crevice; it suddenly disappears D: Man's life between human and god is like a white colt's passing a crevice; it suddenly disappears

关于DBA下列说法正确的是（）。 A: AOLT根据上次计算的结果在下行帧头中下发BWMap。 B: BONU根据带宽分配信息在规定的时隙上发送目前T-CONT中等待发送的数据状态报告。 C: COLT收到ONU的状态报告后，经过DBA计算并更新BWMap，在下一帧进行下发。 D: DONU收到OLT下发的BWMap消息后，在指定的时隙上发送数据。