题目内容
光敏晶体管的（ ）特性是指在给定的光照下光敏晶体管上电压与光电流的关系。
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光敏晶体管的（ ）特性反映了当外界施加的电压恒定时，光电流与光照度之间的关系。
以下（）二极管不是按二极管的结型来分类的。
光敏二极管在没有光照时，反向电阻很小，二极管处于导通状态。
FitnessA study has shown 1 fitness is the key to long life, regardless of body shape or even smoking habits. Researchers discovered that people 2 exercise live longer than those 3 do not. It is clear 4 exercise means so much to our life. So, come on and take actions, from 5 your body can be made healthier.First, start an exercise routine. Choose 6 activities you like, such as soccer, tennis, football, and basketball, 7 are all fun ways to keep fit. Choose a suitable time 8 you want to do exercise.Second, eat a healthy, balanced diet with lots of vegetables and fruits, and drink plenty of water every day.Third, tell your family and friends 9 you want to get fit and ask 10 they'll help. Of course, you can do it alone, but any extra support from friends or ralatives is useful.
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