【简答题】什么是自励和他励发电机?什么样的他励发电机可以成为无刷同步发电机?
【单选题】When a Chinese exporter intends to make a quotation to a foreign customer, which of the following statement about the term of trade is wrong?
【单选题】李某,女,71岁。陈旧性股骨颈骨折,股骨头缺血性坏死。最佳治疗方法是
【单选题】直流发电机类型中不是自励发电机的是( )发电机。
【单选题】Chengdu imports a batch of goods from Tokyo by air. Japanese seller pays freight and insurance premiums and assumes the risk responsibility of the goods to Chengdu. Japanese seller goes through custom...