【简答题】齿轮传动的失效形式主要有轮齿折断、齿面磨损、________、________和塑性变形5种。
【简答题】Platform tickets are not available for CRH trains
【判断题】Platform tickets are available for CRH trains.
【简答题】齿轮传动失效的形式主要有( )、( )齿面磨损、齿面胶合、塑性变形。
【简答题】齿轮传动的失效形式主要有轮齿的折断、 、 、齿面胶合和齿面塑性变形 。
【单选题】Passengers should arrive at the station while their tickets are still valid.
【多选题】PC: P: Here are our tickets, three in all. PC: P: Yes. Where do we board the train? PC: P: Thank you. PC: 1. Are you going to Tianjin? 2. At Platform 2. You have to go through the platform tunnel. ...