A．(A) Florence finished her speech with some introductory remarks.

B．(B) Florence found herself making a speech when the speaker became ill.

C．(C) Florence came along with a fluent introduction about the eminent speaker.

D．(D) Had the speaker not been ill, he would have made some introductory remarks.

单板不在位告警是指（）

A.该单板软件已损坏

B.该槽位没有插单板

C.该单板电源已损坏

D.该单板硬件已损坏