【单选题】按承受载荷的性质分类 , 减速器中的齿轮轴属于 。
【单选题】David has a sore tooth. We can also say David has a _____. [ ]
【单选题】按承受载荷的性质分类,减速器中的齿轮轴属于 ( )
【单选题】按承受载荷的性质分类,减速器中的齿轮轴属于( )
【单选题】听力原文:M: Has David found an apartment? W: David wanted to find an apartment for 300 dollars a month, but discovered he had to pay twice that much. Q: How much did David pay for his apartment? (3)
【单选题】David has few questions to ask,_____?
【单选题】— Isn’t David an efficient manager? —Er, David is really great but sometimes he has problems ______his ideas.