问题
问答题 简答题
为什么电力机车要进行电动机的组合转换？
答案
参考答案：
为了扩大机车的调速范围，增加经济运行级，减小起动电能的损失，改善粘着重量的利用。
搜题请搜索小程序“爱下问搜题”
为什么电力机车要进行电动机的组合转换？
参考答案：
为了扩大机车的调速范围，增加经济运行级，减小起动电能的损失，改善粘着重量的利用。
| 用方框中所给单词的适当形式填空，每词限用一次(每空一词)。 | |
2. The teacher speaks _____ to the older students so they can always hear clearly. 3. In Australia, you can see lots of _____ in the fields and on the hills. 4. Strauss wrote more than 400 waltzes and his most _____ one was The Blue Danube. 5. Yang Liwei was called "China's _____ astronaut" when he returned to Earth after his journey into space. |