【单选题】She said her brother () in Beijing. He () to Japan on business last week.
【单选题】She said her brother ____ in Beijing. He ______ to Japan on business last week.
【判断题】设计一对渐开线直齿圆柱齿轮时,若实际中心距不等于标准中心距,采用变位齿轮可以实现无侧隙啮合。
【判断题】设计一对渐开线直齿圆柱齿轮时,若实际中心距不等于标准中心距,采用变位齿轮可以实现无侧隙啮合。
【单选题】She said her brother ____ in Beijing. He ______ to Japan on business last week.
【单选题】She said her brother ____ in Beijing. He ______ to Japan on business last week.