根据汉语提示完成单词。（5分）

小题1: Let’s                ( 分享) these delicious hamburgers!

小题2: There is only one empty               (座位)in the reading room.

小题3: The food in the restaurant is bad, and the             (服务) is the worst in the town.

小题4: You can                 (选择) which you like best.

小题5: Is it                 (必要)for me to do so ?

无功功率潮流主要取决于母线电压的（）。

A.相角差

B.数值差

C.电阻

D.电抗