每个无阀滤池应设单独的进水系统，（）系统应有不使空气进入滤池的措施。
A.出水
B.冲洗
C.排水
D.进水
参考答案：D
– Have you ____ your brother to give up smoking?
-- No. I talked to him yesterday but he would have none of my advice.
A．persuaded
B．advised
C．promised
D．suggested
OTN光通道帧结构中开销字节与SDH中的C1/C2功能类似的是（）。
A.APS/PCC
B.MFAS
C.TTI
D.JC
