--- Could I have a word with you，Mr. White?

--- OK．__________ you make it short．I've got a meeting in five minutes．

A．as far as

B．if only

C．so long as

D．now that

扩声系统和房间的传输特性产生的频率失真，一般用（）均衡器加以纠正。

A、l倍频程

B、1／2倍频程

C、1／3倍频程

D、1／4倍频程