问题
填空题
浪涌保护器（SPD）是用于低压配电系统中电子信号设备保护的一种（）保护设备。
答案
参考答案：雷电电磁脉冲（浪涌电压）
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浪涌保护器（SPD）是用于低压配电系统中电子信号设备保护的一种（）保护设备。
参考答案：雷电电磁脉冲（浪涌电压）
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| Last winter vacation, I visited Murdoch School in Australia with my parents. It was a beautiful school. 1 the attraction for me was that life at the school was quite relaxing. The students didn’t have 2 schoolbags. The teachers there said classes were from 8 am to 3 pm on weekdays. That means the students 3 only six hours a day for study (one hour for lunch). The teachers don’t 4 too much homework, so the students can 5 themselves on weekends or during winter and summer holidays. But in China, we have to study all the time. Usually, we have to get up at 6 o’clock in the morning and then study 6 10 o’clock at night. There is too much homework for 7 to finish after school. 8 all this, our schoolbags are extremely heavy with many textbooks, reference books, notebooks, and exam papers. Long hours of study and too much homework 9 most of us wear glasses. With light schoolbags, students enjoy school life; with heavy schoolbags, school life does not 10 students anymore. Of course, I really want the former (前者), but who can give it to me? | ||||
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