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【单选题】
根据对 转差功率 处理方式的不同,可把交流调速系统分成 三 类 方法 。A.
变极调速、变频调速 和 改变转差率调速
B.
转差功率消耗型 、 转差功率回馈型 和 转差功率不变型
C.
变极调速、变频调速 和调压 调速
D.
变极调速、变频调速 和绕线式异步电动机转子回路串电阻 调速
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举一反三
【多选题】Complete the passage with items from the box. 在空白处填上合适词汇的选项。
A.
everything
B.
difficult
C.
carefully
D.
teacher E .answer Learning a new language is 1 . Do you want to be a good learner? Here are a few ways. Listen to the 2 carefully in class. Listen to what the teacher says carefully , and then write them down. But you don ’ t need to write down 3 the teacher says. Practice more. Y ou should speak out a lot and 4 the questions as many as possible. Do your homework 5 . Exercises are important to you. If there is anything you don ’ t understand , ask the teacher at the next class.
【简答题】Listen to the new words and Text A of Unit 1 2. Read aloud the new words and Text A 3. Record your reading of paragraph 7: You have to finish reading paragraph 7 in 45 seconds; your reading should be ...
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