【判断题】
FX2N-4AD是模拟量输出单元。
A. 对
B. 错
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答案
B
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【判断题】
电弧的产生是由于触点间隙中的气体被游离，产生大量的电子和离子，使绝缘的气体变成了导体。电流通过这个游离区时所消耗的电能 转变为热能和光 能，因此发出光和热的效应。
A. 对
B. 错
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( ) 26. Where does the writer of "The little Prince" come from?
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【单选题】
( ) 27. What does the prince do after the fox tells him a secret?
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【单选题】
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( ) 32. What may be the proper Chinese for the underlined part in the passage？
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【单选题】
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【单选题】
( ) 34. Judy Foreman copied down the phrase because she ___ .
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【单选题】
( ) 35. Who came up with the phrase according to the passage?
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【单选题】
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( ) 37.The greatest river for navigation is ___________.
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【单选题】
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【单选题】
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