皮皮学,免费搜题
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【简答题】
Questions 5 to 7 are based on the news report you have just heard. Question 5 A) Report the nicotine content of their cigarettes. B) Set a limit to the production of their cigarettes. C) Take steps to reduce nicotine in their products. D) Study the effects of nicotine on young smokers. Question 6 A) The biggest increase in nicotine content tended to be in brands young smokers like. B) Big tobacco companies were frank with their customers about the hazards of smoking. C) Brands which contain higher nicotine content were found to be much more popular. D) Tobacco companies refused to discuss the detailed nicotine content of their products. Question 7 A) They promised to reduce the nicotine content in cigarettes. B) They have not fully realized the harmful effect of nicotine. C) They were not prepared to comment on the cigarette study. D) They will pay more attention to the quality of their products.
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【单选题】在尽头线上调车时,距线路终端应有( )m的安全距离
A.
40
B.
30
C.
20
D.
10
【判断题】《大学》里讲端正是原则,忠正是方向。()
A.
正确
B.
错误
【单选题】在尽头线上调车时,距线路终端应有( )m的安全距离
A.
1
B.
3
C.
5
D.
10
【单选题】关于裂解气的急冷,下列说法错误的是
A.
急冷的目的是终止裂解反应、防止结焦、 回收废热
B.
决定清焦周期,影响全装置的能耗和原料的单耗
C.
直接急冷设备费少,操作简单,换热速度快,传热效果好,能回收高品位的热能
D.
间接急冷无污水,不如直接方式中冷热物流接触空间大,结焦比较严重
【简答题】6-3-11 尼龙6的学名是( )
【判断题】汽车槽车上的安全阀的额定排放压力不得高于槽体设计压力的1.5倍。
A.
正确
B.
错误
【单选题】关于裂解炉的节能措施,下列说法错误的是()。
A.
排烟温度越低越好,以回收烟气热量
B.
加强炉壁温度的测试工作,强化保温隔热措施,减少炉壁散热损失
C.
杜绝炉体空气泄漏,以减少烟气带走的热量
D.
严格控制急冷锅炉的锅炉给水排污,以减少能量损失
【判断题】《大学》里讲端正是方向,忠正是原则。()
A.
正确
B.
错误
【单选题】斜坡岩土体沿贯通的剪切破坏面,产生以水平运动为主的现象,称为()
A.
泥石流
B.
沉降
C.
崩塌
D.
滑坡
【单选题】关于急冷换热器下列说法错误的是()
A.
急冷换热器具备传热强度大、能够承受大压差、能承受热量传递所引起的温差、便于清焦等特点
B.
急冷换热器操作时应避免因停留时间过长,导致二次反应增加造成结焦
C.
通过减小急冷换热器中裂解气的线速度来避免结焦
D.
通过控制裂解气冷却温度不低于其露点,防止重组分冷凝(成膜)影响传热,造成结焦
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