如图所示，电源是两节普通1号干电池串联组成，电池组内阻约为0.2Ω，D是额定电压为2.5V、额定电流为0.3A的手电筒用的小灯泡，L是电阻约为1Ω左右自感线系数很大的线圈，闭合开关s，看到的现象是（   ）

阅读下面材料，在空白处填入适当的内容（不多于3个单词）或括号内单词的正确形式。

    Until recently daydreaming was viewed as a waste of time or it ____ (consider) an unhealthy escape from real life and its duties．But now some people are taking a fresh look at daydreaming．Some think it may be a very ____ (health) thing to do．Some researchers are finding that daydreaming may be important to mental health．Daydreaming, they tell us, ____ a good means  of relaxation．But its benefits go____ this．A number of psychologists have conducted experiments and have reached some____ (surprise) conclusion．

    Dr．Joan T．Freyberg has concluded that daydreaming contributes growth．It also improves____ (concentrate),attention span, and the ability to get along with others．Industrialist Henry J．Kaiser believed that much of his success was due____ the positive use of daydreaming．Florence Nightingale dreamed of becoming a nurse．The young Thomas Edison pictured____ as an inventor．

    For these notable achievers, it appears that their daydreams came  ____．Dr Harry Emerson Fosdick offered this advice: “Hold a picture of yourself…in your mind's eye, and you will be drawn toward it．Picture yourself ____ (vivid) as defeated and that alone will make victory impossible．

①生命属于我们只有一次，无比可贵    ② 敬畏生命、珍爱生命是正确的生命观

③实现生命价值不能追求个人利益        ④每个人的生命对国家、社会、他人都有价值

在硫酸的工业制法中，下列生产操作及说明生产操作的主要原因二者都正确的是 （      ）