问题
多项选择题
消除交流伺服电动机“自转”的方法是（）
A.增大转子转动惯量
B.减小转子电阻
C.减小转子转动惯量
D.增大转子电阻
E.增大转子质量
答案
参考答案：C, D
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消除交流伺服电动机“自转”的方法是（）
A.增大转子转动惯量
B.减小转子电阻
C.减小转子转动惯量
D.增大转子电阻
E.增大转子质量
参考答案：C, D
阅读下面的短文，然后从每小题所给的四个选项中选出一个最佳选项，并将答题卡上的相应选项涂黑。 My daughter’s 7th birthday was April 22. As it was Monday, we preferred to celebrate it ___11___, i.e. on Saturday, April 20. This was easier for me as I’m ___12___ on Saturdays. On Friday the entire family was busy packing the ___13___ and putting funny pins on them. I promised my little princess that I would wake her up early in the morning and give out the presents to her ___14___. I woke up at 07:30. After I took a bath, I planned to wake her up. But as I came out from the ___15___, I realized that an earthquake struck. I ___16___ to wake my husband up and asked him to carry our daughter and ran out of our house. We were ___17___ our house moving from side to side from outside. It lasted for just 3 minutes, but tiles(瓦片) came down, and some narrow gaps appeared on the ___18___. Nevertheless, as we had planned, I went to my daughter’s school at 9:00, but no one was there except the teacher who ___19___ us to get back to our house as ___20___ might come soon. I was shocked, and drove my car home. On the way home I heard a police cry out loud, “Stay ___21___, no tsunami, it’s only issue!” Arriving at my house, I was wondering about the presents: to whom we should ___22___? After some discussion, we decided to give them to the children in ___23___. Entering the hospital, I was shocked to find thousands of people bleeding and lying outside the rooms. A boy came up with a ___24___ on his head. He stared at me with his questioning eyes as if he wanted to say, “Could I have one?” ___25___ I handed over one present to him. I can’t ever forget his shining eyes when he received the gift!
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