题干

某同学在学习家庭用电知识时:

 

(l)他设计了A、B、C、D四组有关插座、螺口灯泡、开关的家庭电路如图甲所示,其中连线正确的一组是____ .

(2)天气渐冷,该同学家中购置了一台金属外壳取暖机,为用电安全,接入家庭电路时,应选用图乙中____ (选填“E”或“F”)插座,它能保证取暖机金属外壳与____ 相连.

(3)图丙中G、H是使用测电笔检测的两种握笔方法示意图,其中正确的是____ .

(4)该同学家电能表的表盘如图丁所示,其读数是____ kW•h.若电能表的表盘转了300转,则该同学家的用电器总共消耗了____ J的电能.

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答案(点此获取答案解析)

B,F,大地,C,314.5,1.8×106 

同类题2

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    You may not know a lot of people when you start high school. Maybe your friends from middle school are going to a different high school. Even if you know other freshmen(新生), you still feel nervous that you don't know any upper-classmen. How are you going to make friends among this sea of unknown faces?

    Most high schools hold a freshman orientation(训练) before school actually starts. These are helpful not only because you learn your way around the building and get to meet some of your teachers, but you also get to meet fellow freshmen. That way, when you show up on your first day of school, you may already recognize a few familiar faces.

    When you talk to people at orientation, you'll probably find that a lot of them are feeling just like you are. They're all new to the school and don't know what to expect. Talking about a common concern with your classmates can help you develop friendships.

    The work in high school is something freshmen are probably worried about. The work in high school builds on what you learned in middle school, giving you a more advanced knowledge of many subjects. So you may find you have more work to do or that it's a bit more challenging. If you ever find your work too difficult, teachers can give you extra help.

    High school also has more after-school activities than middle school did, such as clubs, music and theater groups and sports teams. This is a good time to explore your interests and try new things.

    Middle school taught you the basics of academics, time management, and social skills while providing you with a little extra support and guidance. High school gives you the chance to learn how to be more independent and responsible.