题干

下列关于能量转化的说法正确的是(   )

A:砖木取火的过程中,内能转化为机械能

B:电动机在通电转动过程中,机械能转化为电能

C:人造卫星从近地点向远点沿椭圆轨道绕地球运动过程中,重力势能转化为动能

D:汽油机工作过程中,化学能转化为机械能

上一题 下一题 0.0难度 选择题 更新时间:2019-05-21 10:55:05

答案(点此获取答案解析)

D

同类题2

阅读下列四篇短文,从每小题后所给的A、B、C、D四个选项中,选出最佳选项,并在答题卡上将该选项涂黑。

Dear Editor,

    I'm a Senior 1 student in a middle school. This term, my favourite teacher, Miss Mao, no longer teaches us. I want to see her, but I'm afraid that she no longer likes me and I don't want to trouble her. I really miss her. What should I do?

                                                                                                                                                                                           Tian Yan  

Dear Tian Yan,

    It's bad luck that you have lost your favourite teacher. But, if she is still in your school, nothing can stop you going to see her. When she isn't busy, ask her if she minds having a quick chat. You can then tell her she wa s your favourite teacher. Everyone is happy to know they are liked!

    If she has left the school, it will be more difficult to meet her. It will be hard, but remember people always come and go in our lives. We can't rely on them being with us all the time.

    You may be sad to say goodbye to her, but we can remember and learn from her. Think of her best qualities.    

    You could also try looking for similar qualities in your other teachers. Study hard and give your new teacher a chance. In time, you might start to see that he or she has different qualities to learn from.

    Finally, you can not completely(entirely) rely on(depend on) other people getting you through your studies, or even your life.

                                                                                                                                                                                          Editor