问题
单项选择题
以恒频交流电源为主电源的飞机上，变压整流器是把（）。
A.单相交流电变为24伏直流电
B.三相交流电变为115伏交流电
C.单相交流电变为36伏直流电
D.三相交流电变为28伏直流电
答案
参考答案：D
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以恒频交流电源为主电源的飞机上，变压整流器是把（）。
A.单相交流电变为24伏直流电
B.三相交流电变为115伏交流电
C.单相交流电变为36伏直流电
D.三相交流电变为28伏直流电
参考答案：D
Many parents want their children to be famous one day. But do children have the same ? A new — Hi, Ke’ai is on at Beijing Children’s Art Theater. It tells the story of a boy called Ke’ai. His parents would like him to become a painter or a one day. They teach him to and to play the violin, but Ke’ai doesn’t enjoy these activities. Then one day Ke’ai’s parents see Liu Xiang win a gold at the Athens Olympic Games, and they want him to be a sportsman. “ do they want me to be someone else?” Ke’ai asks and says, “I only want to be .” The play shows us that it is good for parents to learn to their children. It helps parents to think about what kids want to do. Young audience (观众) enjoy the story, and also the in the play. There are two songs in the play. One of them, Ke’ai’s Song is very to learn, so the audience can sing the song on their way home after the play!
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