题目内容
软开关电路可以分为哪些几类?其典型拓扑分别是什么样子?各有什么特点?
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I am really sorry to say it, but I'm afraid that I _____ make it on time, cause my plane was postponed, could we make it later?
there is something unexpected _______________, I have to stay to deal with it.
三相桥式PWM逆变电路的结构，是采用双极性调制方法。
Section DListen to the following passage and fill the missing words in the blanks.There is more in __20__ than just learning facts. We go to school, above all, to learn how to learn, __21__, when we have left school, we can continue to learn. A man who really knows how to learn will always be __22__, because whenever he has to do something new which he has never had to do before, he will rapidly teach himself how to do it in the best way. The uneducated person, on the other hand, is __23__ unable to do something new, or does it __24__. The purpose of schools, therefore, is not just to teach languages, arithmetic(算术), geography, etc., but teach pupils the way to learn.
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