【判断题】
沸程又叫馏程,它是指单组份烃在一定压力下从初馏点到干点的温度范围
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【判断题】
由于管线上的静电量小,因此没有什么危险
【判断题】
当高压蒸汽温度测量的两个热电偶中任一个超过联锁设定值时,就要发生联锁动作
【判断题】
与无机物相比,有机物的特点是熔点较高,易燃,难溶于水和有机溶剂
【判断题】
在同一个原子中,不可能有运动状态完全相同的电子存在
【判断题】
一般地,裂解气的产气率随原料中氢含量的增加而增加
【判断题】
在工业裂解炉的工程设计中,影响乙烯选择性的根本因素是平均停留时间和平均烃分压
【判断题】
为了有效地降低二次反应,急冷锅炉将裂解气温度冷却的越低越好
【判断题】
提高废热锅炉蒸汽压力,可提高管壁温度,加快废热锅炉结焦
【判断题】
安全阀应安装在被保护设备,管线的最近位置上
【判断题】
1211灭火器适用于电气设备火灾,但不适用于油类着火
【判断题】
我们在工厂中所称的“压力”,实际上就是压强
【判断题】
原子核外的电子是按能量大小,从高到低依次填入轨道的
【判断题】
一般地,裂解气中乙烯收率随原料氢含量的减少而减少,C5以上液相产物的收率则随原料氢含量的减少而增加
【判断题】
从热力学角度看,同一正构烷烃分子在相同条件下,断链反应比脱氢反应容易进行
【判断题】
从热力学角度看,不同分子在同一条件下,分子中碳原子数较多的比碳原子数少的分子容易发生断链反应
【判断题】
烷烃中异构烷烃比相同碳原子数的正构烷烃裂解产物中CH4、C3H6、丁烯及芳烃产率低
【判断题】
环烷烃裂解生成的乙烯、丙烯的产率不如链烷烃高,但大于烯烃和芳烃
【判断题】
一般认为,脱氢反应是可逆反应,断链反应是不可逆反应
【判断题】
随着裂解反应进程的加深,甲烷收率总是增大的,因而甲烷收率的增加在一定程度上可以反映出裂解反应的深度
【判断题】
稀释比增大,可提高炉管内的物流速度,增大膜温降
【判断题】
对USC型炉,当运行方式开关置于“NOR”位置时,不管是否摘除汽包液位低联锁,当汽包液位低于联锁设定值时,都将输出跳闸信号
【判断题】
芳烃的芳环具有强的热稳定性,在裂解过程中不易发生开环反应,而易发生侧链断链反应
【判断题】
当裂解炉烃进料量降低时,稀释蒸汽量也应相应降低,以保持一定的稀释比
【判断题】
加入正催化剂,将使平衡向正反应方向移动
【判断题】
芳烃的芳环具有强的热稳定性,在裂解过程中不易发生开环反应,而易发生侧链断链反应
【判断题】
蒸汽管网容量越大,则喘振振幅越小,反之,则越大
【判断题】
在环烷烃的裂解反应中,侧链烷基比烃环易发生反应
【判断题】
DCS的仪表调节状态之间进行切换时,可由串级状态直接切到手动状态,但不能由手动状态直接切到串级状态
【判断题】
当裂解炉烃进料量降低时,稀释蒸汽量也应相应降低,以保持一定的稀释比
【判断题】
干粉灭火器与蛋白泡沫和一般合成式泡沫联用,效果会更好
【判断题】
液体的沸点与气压有关系,气压增大,沸点升高
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take a toll on,in other words ,drop out,in turn ,at risk (of) ,interfere with,be accustomed to, contribute to,cut back on ,hold on to
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take a toll on,in other words ,drop out,in turn ,at risk (of) ,interfere with,be accustomed to, contribute to,cut back on ,hold on to
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take a toll on,in other words ,drop out,in turn ,at risk (of) ,interfere with,be accustomed to, contribute to,cut back on ,hold on to
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make it, with open arms ,strip off,keep back,
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make it, with open arms ,strip off,keep back,
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make it, with open arms ,strip off,keep back,
free of/ from ,after all,straighten up, throw away
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make it, with open arms ,strip off,keep back,
free of/ from ,after all,straighten up, throw away
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make it, with open arms ,strip off,keep back,
free of/ from ,after all,straighten up, throw away
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advocate,involve,confine,respond,subsequent ,distinct ,intense, fulfill,circumstance, reconcile
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advocate,involve,confine,respond,subsequent ,distinct ,intense, fulfill,circumstance, reconcile
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