电功率的含义是（）
参考答案：电流在单位时间内所做的功
Look! A large number of boys _____ the ground, the number of them _____ 20. [ ]
A. is running, are
B. are running, is
C. are runing, is
地方课程的编定权在（）
A.国家
B.省、自治区和直辖市
C.县
D.校
