【判断题】
去干燥器的裂解气的温度控制过低，会形成烃水合物（白色晶体）.而使床层阻力降上升，裂解气压缩机负荷增大及管线、设备堵塞
A. 对
B. 错
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【判断题】
运行安全要求反应器在设计的压力和温度下进行.尤其要注意温度上升很快的情况、因为加氢反应是强放热 反应.当温升很快时有可能形成局部热点而发生非接触式反应，失去控制造成严重后果
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【判断题】
乙烯装置冷箱结构复杂，流道尺寸小，容易堵塞，而且检修和清洗困难、因此所处理的物料应洁净或预先净制。另外，由于隔板和翅片均由蒲铝板制成，一旦腐蚀造成内漏很难发现和检修，故要求换热介质对铝材无腐蚀性。正确答案、
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【判断题】
如果检修时人要进入用氮气置换后的设备内工作，则事先需用压缩风进行吹扫，将氮气驱净，待氧气与有毒有害气体含量分析合格后方可进入。否则人进入设备后会发生因氮气窒息而死亡
A. 对
B. 错
【判断题】
碳二加氢催化剂再生采用蒸汽-空气烧焦方法。催化剂在再生过程中，要严格控制空气量以防催优剂床层飞温使催化剂失效。床层温度太高时要立即切断空气进入床层，待催优剂床层温度下降后再緩慢通入空气继续烧焦。正确答案、
A. 对
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( ) 26. Where does the writer of "The little Prince" come from?
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【单选题】
( ) 27. What does the prince do after the fox tells him a secret?
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( ) 34. Judy Foreman copied down the phrase because she ___ .
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( ) 36. What can we infer from the last paragraph?
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( ) 37.The greatest river for navigation is ___________.
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【单选题】
( ) 38. From a dam, people can use the water for ___________.
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【单选题】
( ) 39. The water in the river is polluted because of _____________.
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【单选题】
( ) 40. The best title of the passage is ___________.
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