题干

请在图中用笔画线代替导线将灯泡与开关正确接入电路,并将三孔插座正确接入电路.

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答案(点此获取答案解析)

解:首先辨别上面三根线火线、零线、地线.

灯泡接法:火线进入开关,再进入灯泡顶端的金属点,零线直接接入灯泡的螺旋套,这样在断开开关能切断火线,接触灯泡不会发生触电事故.既能控制灯泡,又能更安全.三孔插座的接法:上孔接地线;左孔接零线;右孔接火线.如图所示:

同类题4

任务型阅读

    When I was seven years old, I got the greatest Christmas gift ever.____Now I realize I actually have the power to be a superhero. I may not able to fly, but I make a difference to someone's life. We all have the power to be a superhero to someone. Here are four ways you can be a real life superhero.

    ____Think about what it is. It could be your support, time, advice, a small gift or a thank-you card. Sometimes, even just the most harmless message can bring someone out of darkness and into the light. It's something that you have to give that can help others.

    Keep yourself healthy.____Look after your body and helping people will be easier. You'll have a clear mind and energy to achieve any task in your way.

    Pick your fight. Every superhero has a battle. It's something that drives them to be the person they are.____It could be anything such as working towards helping reduce the number of homeless people on the street. The fight does not need to be big, but it needs to be powerful.

    Make someone's day. Real life superheroes try to improve the lives of all the people they meet.____You can also try your best to absolutely make someone's day every once in a while. The people who get your help will thank you for it.

A. What's your fight?

B. Stay happy all the time.

C. It was a Batman costume, complete with bell and shoes.

D. Use the things you have to help someone without them.

E. You can't be a superhero if you don't take care of your body.

F. They try their best to turn someone's bad day into a good one.

G. They just want to get up, save the world and forget it ever happened.