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听对话,回答问题。 1. How will Amy go to Beijing this winter holiday? A. By plane. B. By car. C. By train. 2.What is the time now? A. 6: 45. B. 7: 00. C. 7: 15. 3. Which sport does Mike like? A. Skiing. B. Swimming. C. Fishing. 4. What did Ben do yesterday? A. He had a picnic. B. He looked for things on the Internet. C. He went out. 5 How long has Lucy been back? A. Three days later. B. Three days ago. C. For three days. 6. How's Jim? A. He's OK. B. He's ill. C. He's returned home. 7. What colour shoes did the man want to buy at first? A. Brown. B. Blue. C. Black. 8. What does the woman mean? A. She likes smoking. B. She doesn't mind the man's smoking. C. She doesn't want him to smoke. 9. What does the woman have for breakfast now? A. rice and fruit B. rice and eggs C. coffee and bread D. bread and fruit 10. How much does one cup cost if she buys two? A. ten yuan B. nine yuan C. twelve yuan D. eighteen yuan
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【简答题】如何使三相异步电动机反转?反相运转与反接制动有何区别?
【单选题】Chinese historians tried to ______ a balance between the data of history and their significance.
A.
produce
B.
upset
C.
strike
D.
tip
【简答题】如何使三相异步电动机反转?
【简答题】旋转磁场的形成条件是什么?转动方向是由什么决定的?如何使三相异步电机反转?
【单选题】One of the most important results of research into ageing has been to pinpoint the significance of short-term memory. This faculty is easily (1)_____ as ageing advances. What seems to (2)_____ is that...
A.
discovered
B.
strengthened
C.
displayed
D.
disturbed
【单选题】One of the most important results of research into ageing has been to pinpoint the significance of short-term memory. This faculty is easily (1)_____ as ageing advances. What seems to (2)_____ is that...
A.
discovered
B.
strengthened
C.
displayed
D.
disturbed
【判断题】电气化单线维修天窗不应少于70min(中级线路工用)。
A.
正确
B.
错误
【简答题】如何使三相异步电动机反转?
【简答题】6 如何使三相异步电动机反转?
【简答题】7 某绕线式三相异步电动机技术数据为:PN=60kW,nN=960r/min,E2N=200V,I2N=195A,λ=2.5。其拖动起重机主钩,当提升重物时电动机负载转矩TL=530N·m。 (1) 电动机工作在固有机械特性上提升该重物时,求电动机的转速; (2) 不考虑提升机构传动损耗,如果改变电源相序,下放该重物,下放速度是多少? (3) 若使下放速度为n=-280r/min,不改变电源相序,...
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