题目内容
组合体视图读图常见的题型有“一直两个视图，求作第三视图”和“补画三视图中的漏线”两种。
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解决组合体读图类题型的基本思路是先由已知视图看懂物体的形状，再根据所想像的物体的形状，画出第三视图或补画视图中的漏线。
1) The passage discusses the Freshman 15. It represents the amount ofthat a freshman gains during his/ her first year of college.2) If the freshman 15 is true, this means that freshmen gain 15 pounds on average due to changes in their and .3) Thrown into a demanding environment, students may have difficultythe stress, and the they may turn to even when they are not hungry. When people eat to reduce stress, it is called .4) When they have busy schedules, students often eatand eat unhealthy food with a lot of fat and.5) There is also a change in students’ lifestyle. They may become less active. For example, they may get stuck in their rooms or the library studying instead ofin sports or other activities.
晶闸管的导通条件:；关断条件: 。晶闸管导通后门极的作用是。
以下电力电子器件中，属于电压驱动型器件的有，属于电流驱动型器件的有。
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