问题
填空题
光电电眼有两种设定点，一个是（）和（）。
答案
参考答案：PNP；NPN
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光电电眼有两种设定点，一个是（）和（）。
参考答案：PNP；NPN
| 从方框中选择正确的句子完成对话，其中两项为多余项。 | |
| Reporter: Hi, I'm doing a survey for the Bedford Daily News. 1 Boy: I guess Jammin' 107 FM is the best. Reporter: Why? Boy: 2 It's much better than the other stations in town. Reporter: What about the other radio stations? Boy: Well, I think Oldies 102.1 FM is very bad. 3 Reporter: I heard that. 4 Boy: Not for me. Reporter: Why not? Boy: 5 They're worse than the commercials of All Talk 970 AM!
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