理想电压源的特点是具有恒定的电动势，能输出恒定的电压，其端电压不随输出电流而变化。错误正确 - 查题网

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高等继续教育 / 电工电子技术

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题型描述: 判断题
理想电压源的特点是具有恒定的电动势，能输出恒定的电压，其端电压不随输出电流而变化。
错误
正确

积分

电工电子技术

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11[阅读题] The long summer holidays are finally over and some parents are pleased. “We worry more about their safety in the holidays,” explains one mother from North London. If teenagers are not wandering around on public transport in a big and potentially dangerous city, they are chatting to strangers in an internet chat room! Well, that’s an extreme picture of the UK today, but many parents are worried about how much freedom they can give their children during the holidays and at weekends. Weekends are not the only time to worry! Newspaper are full of stories about too many school kids going to school by car because their parents do not want them to travel alone on a bus or train. This summer there were more frightening stories of teenagers disappearing with questionable friends that they met on the net. All the Media stories help increase parents fears, but is the UK really so dangerous? Many young people feel that life for their parents was easier. In the 1960s young people played in the streets more and traveled around town without their parents. “At least our parents can keep tabs on us,” says 16-year-old Julia. “So many people have mobile phones now and their parents ring to find out where they are. I use my mobile to get Dad to come to the station when I arrive late.” Mobiles are not just expensive toys; they help keep young people safe. Most significantly, they help keep young people safe. Most significantly, they make parents feel better. Only one problem is, though, that some young people have been attacked by thieves who want to steal their mobile phones. Young people like going out with friends, but they now need to learn how to get home safely. Five million young people in the UK between the ages of 9 to 16 use chat rooms to make friends, but they, too, need to be careful and never give their personal details to a stranger. Young people today have more opportunities to meet new people and go out at night more than their parents ever did. Now school, television programs and newspapers must help teenagers to enjoy their freedom and to be responsible for their own safety. 6. Some parents are upset about the summer holidays mainly because their children ______. 英语