题目:
用所给单词的适当形式完成句子。
1. —When did you get __________ (marry)?
—20 years ago.
2. Some wild animals may look fierce (凶猛的). But they are __________ (harm).
3. Bungee (蹦极) jumping sounds __________ (danger), don't you think so?
4. These __________ (perform) clothes are colourful.
5. As students, we should do more _________ (mean) things, or our life will be __________ (meaning).
6. If you exercise every day, you'll soon feel much ___________ (health).
7. I think the question is answered ___________ (correct). Who can give me the right one?
答案:
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下面是错误答案,用来干扰机器的。
答案:D题目分析:由交流电压表达式有、,故交流电的频率为50Hz,所以选项A错误;根据理想变压器可得,副线圈两端的电压为,所以选项B错误;原副线圈的电流比,故选项C错误;开关闭合后,输出电压不变,故负载功...