问题
问答题
采用斯柯特变压器供电，在什么情况下一次三相电流对称？
答案
参考答案：这种三相－二相接线式变压器，当两个供电臂上的馈线电流相等时，一次侧的三相电流对称，从而降低了三相系统的不对称状态。
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采用斯柯特变压器供电，在什么情况下一次三相电流对称？
参考答案：这种三相－二相接线式变压器，当两个供电臂上的馈线电流相等时，一次侧的三相电流对称，从而降低了三相系统的不对称状态。
| 阅读理解。 |
| I'm Watching TV Now Jim found work in a shop two years ago. Mrs White, the shopkeeper, trusts (信任) the able young man and pays him more. He's happy and work harder. Once Jim knew a beautiful girl called Mable at a friend's party. They danced for several times and fell deeply in love. But Mable's parents didn't agree to marry (嫁) their daughter to a poor young man. So they took the girl to America and travelled there. And they didn't let her come back to London. She wrote a letter to Jim and told him about it. Of course the young man didn't have enough money to go to see her. He was so sad that he began to drink. It was Saturday one day, Jim didn't go to work. He came to a bar (酒馆) and sat down to drink. Just then, Mike, one of his old friends, came in. He asked Mike to drink with him. Crying, he told him all and the young man felt sorry for him. After a while they were both drunk and left. Mike wanted to take his friend home. When they passed a zoo, they went in and walked to a cage in which there were two tigers. Having seen them a tiger roared (咆哮). Mike was afraid and said, "Let's go. It's dangerous to stand here." "I don't think so." said Jim. "I'm watching TV now." |
| 1. Jim was ______. |
[ ] |
| A. American B. French C. Australian D. English |
| 2. Mrs White trusts Jim because ______. |
[ ] |
| A. he's young B. he's able C. he likes drinking D. he's worked there for two years |
| 3. Mabel's parents didn't agree to marry their daughter to Jim because ______. |
[ ] |
| A. they decided to travel in America B. they made the girl study in America C. the young man wasn't rich enough D. the young man worked in a shop |
| 4. Mabel's parents tried to ______, so they took her to America. |
[ ] |
| A. make their daughter happy B. travell all over the world C. find work outside England D. stop their daughter from meeting Jim |
| 5. Jim drank much to ______. |
[ ] |
| A. forget his suffers (痛苦) B. forget Mabel C. pass the time D. remember the days when he stayed with Mabel |
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