题目

—Mum, I’ m going to Ann’ s party this evening.—_____.A. Why not                                             B. Have a good timeC. Come back early                                 D. Good idea 答案：B在国际单位制中，电压的单位是（ ）A. 乔布斯 B. 欧姆 C. 刹马特 D. 伏特