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一、选择题 (每小题 2分 ,共 30分 )1.下列有关能量的说法正确的是 ( )A.电磁感应现象中 ,电能转化为机械能B.空中匀速下降的降落伞 ,重力势能转化为动能C.干电池对外供电时 ,化学能转化为电能D.电流做功的过程 ,是电能转化为机械能的过程2 .在 a.人游泳 ;b.人走路 ;c.飞机
First, the multiple-choice questions (2 points for each question, a total of 30 points) 1. The following statement about energy is correct () A. In the electromagnetic induction phenomenon, the electrical energy is converted into mechanical energy B. The parachute with a uniform drop in the air, the gravity potential energy is converted into Kinetic energy C. When the external battery is powered by a dry battery, chemical energy is converted into electrical energy D. The process of current doing work is the process of converting electrical energy into mechanical energy 2. In a. People swim; b. People walk; c.