直接通电磁化管状工件，有效磁场限于在外表面_爱下问搜题

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问题判断题

直接通电磁化管状工件，有效磁场限于在外表面

答案

参考答案：对

完形填空

One effective way of destroying happiness is to look at something and focus on even the smallest fault. It’s like looking at the tiled (铺瓦的) ceiling and concentrating on the space where one tile is    1  .
Once I heard a bald man said, “Whenever I enter a room, all I see is hair.” Once you’ve    2   what your missing tile is, explore whether acquiring it will    3   make you happy. Then do one of the three things: get it, replace it with a different    4 , or forget about it and    5  the tiles in your life that are not missing.
We all know people who have had a relatively    6  life, yet are essentially unhappy, while people who have suffered a great deal generally remain happy.
The first    7  is gratitude. All happy people are grateful. Ungrateful people cannot be happy. We tend to think that being unhappy leads people to    8 , but it’s truer to say that complaining leads to people becoming unhappy.
The second secret is awareness. We should    9   that happiness is a byproduct (副产品) of something else. The most obvious    10   are those pursuits ( 追求) that give our lives purpose---anything from studying insects to playing baseball. The more passions we have, the more happiness we are   11   to experience.
Finally, the belief that something permanent goes beyond us and that our   12   has some larger meaning can help us to feel happier. We need a spiritual faith, or a philosophy of life. Whatever your philosophy is, it should    13  this truth: if you choose to find the   14   in every situation, you will be blessed, and if you choose to find the awful, you will be cursed. As for happiness itself, this    15   depends on your decision to make.

D．destination

填空题案例分析题

下图示某草原生态系统的食物网，请回答：

图中只体现了生态系统的成分中的两种，未体现的另两种成分是（）