题目内容
电枢是电动机中能转动的部件,它由叠片构造的铁心和绕在铁心上的漆包线等构成,用它建立转矩。( )
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起动机的电磁开关中的两个线圈分别是保护线圈和吸引线圈。( )
起动机中换向器的作用是将交流电变成直流电。( )
起动机主要由直流串励电动机、传动机构和控制装置组成。( )
Section BDirections:In this section, you will hear two long conversations. At the end of each conversation, you will hear four questions. Both the conversation and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A), B), C), and D). Then mark the corresponding letter on Answer Sheet 1 with a single line through the centre.Questions 8 to 11 are based on the conversation you have just heard.[音频]8. Questions 8 to 11 are based on the conversation you have just heard.
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