选择相应的答句。
（____）1. Are you going to join us?
（____）2. What are you going to do at the party?
（____）3. Are there any good plans for the party?
（____）4. Where are we going to have the party?
（____）5. When did you go?
A.Yes, there are.
B.At Mike's house.
C.At eight o'clock.
D.Yes, we are.
E.Tell a story.
线，直线B为电阻R的U — I图线，用该电源和电阻组成闭
合电路时，电源的输出功率和电路的总功率分别是 
（ ）