异步电动机是根据导体切割磁场产生()和载流导体在磁场中受到()的作用这两条原理工作的。
参考答案:感应电动势;电磁力
选择合适的词并用其正确形式填空。
Near our school there is a store.It’s small but there’re lots of school 小题1: .Do you like exercise books, erasers, pens or color pencils? They小题2: cheap.The erasers are just l Yuan, The color pencils are just for 2 Yuan.I小题3: a cartoon(卡通)pencil sharpener.It is not expensive(贵的),either.I’ll小题4: it. Do You want some school things for小题5: ? Just come to this store and have a look.
编制修理单的依据之一是()。
A.修理内容
B.修理要求
C.公司的有关规定
D.船厂要求