-- How do you find the performance by the pianist?

-- ______. I can't think too highly of it.

A．It's really wonderful

B．It all depends

C．No one knows for certain

D．It is not my cup of tea

5V的一路供内部IC用，12V的一路用以驱动输出继电器，24V的一路提供给用户以作（）的电源。