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单项选择题
Section 3 Questions 21-30 Question 21-26 Choose the correct letter, A, B or C. Rocky Bay field trip 21. What do the students agree should be included in their aims?
A、factors affecting where organisms live
B、the need to preserve endangered species
C、techniques for classifying different organisms
D、/
B、the need to preserve endangered species
C、techniques for classifying different organisms
D、/
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问答题
【填空题】写出对应的全控器件的英文缩写：门极可关断晶闸管___________，绝缘栅极型场效应管____________，绝缘栅双极晶体管___________
答案：
门极可关断晶闸管 GTO (Gate Turn-Off Thyristor)，绝缘栅极型场效应管 IGBT (Insul...
