Airtours conceded defeat in its attempt to take control of holiday industry rival Owners Abroad...空中旅游公司承认其对度假服务行业竞争对手海外业主旅行社的控股企图以失败告终。Aerodist is a useful equipment for secondary breakdown , but not for primary control...
He developed an armillary sphere, on which were carved all the astronomical phenomena known time.经过多年的观察,他研制了一架“浑天仪”.凡是知道的重要天文现象, 都刻在“浑天仪”上了.And a new type sphere - conical roller and globoid cam graduator is designed.并在...