-- Today is Tom’s birthday. Let’s have a birthday party tonight, shall we?

--- ____________.

A．It’s my pleasure.

B．Good idea

C．It’s very kind of you

D．It’s quite all right

接在家庭电路中的电能表， 利用它可直接测量的是

A．电流

B．电压

C．电功

D．电功率