【简答题】The best way of learning a language is using it. The best way of learning English is talking in English as much as you can. Sometimes you’ll get your words mixed up and people will not understand you....
【单选题】从某一个城市看,港口的市场竞争模式属于()
【判断题】产品的开发周期、成本、质量和制造的效率无不受到产品开发的影响。()
【单选题】汽油发动机在中等负荷工况时,过量空气系数应为( ) 。