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【简答题】
选择最佳选项。补全对话 。 A: Are you Jim? B: 1 I'm Tim. A: 2 B: That's all right. A: Are you Miss Green? C: 3 A: Tim, this is Miss Green. Miss Green, this is Tim. B: Nice to meet you. C: 4 Welcome to our class. B: 5 ( )1. A. Yes, I am. ( )2. A. Sorry. ( )3. A. No, I'm not. ( )4. A. How are you? ( )5. A. Thank you. B. No, I'm not. B. Thank you! B. My name is Kate Green. B. Good morning. B. That's all right. C. My name's Tim. C. Nice to meet you! C. Yes, I am. C. Nice to meet you, too. C. Sorry. D. It's not my name. D. Sit down, please! D. It's my name. D. How do you do? D. Fine.
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皮皮学刷刷变学霸
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【简答题】感应电动机的等效电路中转子总的等效电阻 可分解为 和 两项,这两项分别代表(什么损耗或功率) 和 ;它们(能否) 用电感或电容代替。
【单选题】三相感应电动机等效电路中的附加电阻 R 2 ' 上所消耗的电功率等于()
A.
输出功率 P 2
B.
转子铜耗 P Cu2
C.
电磁功率 P em
D.
总机械功率 P Ω