将下列句子排成一段通顺的话。

( ) Great.

( ) Good afternoon, John. How are you?

( ) Let's paint.

( ) I'm fine, thanks. How are you?

( ) Very well, thank you.

操作不当和电磁干扰引起的故障属于（）。

A、机械故障

B、强电故障

C、硬件故障

D、软件故障