--You ought to have given them some advice.

--________, but who cared what I said?

A．so I am

B．so am I

C．so did I

D．so I did

一台计算机具有比较高的“可用性”(Availability)，其含义是指( )。

A．它的MTBF比较低，MTTR比较高

B．它的MTBF比较高，MTTR比较低

C．它的MTBF和MTTR都比较高

D．它的MTBF和MTTR都比较低