①真理是具体的有条件的           ②意识可以调控人体的生理活动

③人脑是意识活动的物质器官       ④人们可以认识和利用客观规律

某课外活动小组根据Mg与CO₂的反应原理，探究Mg与NO₂的反应及固 体产物．该小组通过实验确认Mg能在NO₂中燃烧，并对间体产物提出三种假设：

I．同体产物为MgO．

II．假设为____ ．

III．假设为：____ ．

请回答下列问题：

资料信息：2NO₂+2NaOH=NaNO₃+NaNO₂+H₂O

（1）如图连接好仪器，装药品前如何检验装置的气密性____ ．

（2）装置B中盛装的干燥剂可以是（填序号）____ ．

①浓硫酸②无水CaCl₂③碱石灰④五氧化二磷

（3）开始打开活塞k，让A中反应进行一段时间，待C中充满红综色气体后，关闭 活塞k，再点燃C处酒精灯，同时D中碱液盛的很满，这样做的H的都是____ ．

（4）E中收集到的气体对氢气的相对密度是14，该气体是____ ．

（5）实验得到阀体残留物的质量是实验前Mg粉质铽的1.5倍，则假设____ 成立．C中发生的化学反应方程式为　____ ．

（6）本实验中存在明显缺陷，改进措施是____ ．

    Charles Dickens was born in one of the small towns in England.

    When Dickens was nine years old, his father found a job in London and the family moved there. Later on his father was put in to prison(监狱)for owing(负债). His mother could not supply(供应) enough food to him and his younger brothers and sisters. He had to do something for his family, so he could not go to school.  

    Only until his father was out of prison, Charles could go to school. At that time he was already twelve. But he did not finish school. Two years later he began to work in a factory.

    And at first he was a journalist(记者)and wrote for newspapers. The future writer often went to the library to read books. He read a lot. Then, at the age of twenty-two, Dickens began to write and he wrote a lot of novels and stories all his life.Dickens died over a hundred years ago，but people are still reading his books with great interest.

如图，l∥m，等腰直角三角形ABC的直角顶点C在直线m上，若∠β=20°，

则∠α的度数为（　　）