题目

Plant scientists consider them as fruit. Most other people think of them as vegetables. Whatever you call tomatoes, there are many different kinds of this popular and healthy food.There are two groups of the plants. Small tomato plants grow to about one meter. They can be planted rather close together. Some short kinds do not require special care and are often gotten crop by machines. Large tomato plants can grow over two meters tall. They also produce larger fruits.People who grow only a few plants can place wire cages around each one. The cage can be made of wire fence material. The cage hel关于能量的转化和转移，下列说法错误的是A. 手机电池充电，电能转化为化学能 B. 高压锅塞被热气冲开，机械能转化为内能C. 抽油烟机机工作，电能转化为机械能 D. 钢锯条锯木头时生热，机械能转化为内能 B 【解析】A、电池充电，消耗了电能，得到了化学能，因此将电能转化为化学能；说法正确；B、高压锅塞被热气冲开，消耗了内能，得到了机械能，故将内能转化为了机械能；说法错误；C、抽油烟机机工作，消耗了电能，得到了机械能，因此将电能转化为机械能；说法正确；D、钢锯条锯木头时生热，消耗了机械能，得到了内能，因此将机械能转化为内能；说法正确。故选B．