【判断题】
[86]在传热时,并流时的平均温差小于逆流时的平均温差。
A. 对
B. 错
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答案
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解析
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相关试题
【判断题】
[87]采用两台型号相同的离心泵串联操作可提高扬程,并联可增大流量。
A. 对
B. 错
【判断题】
[88]E-206是用循环水加热的。
A. 对
B. 错
【判断题】
[89]理论塔板数与实际塔板数之比,称为板效率。
A. 对
B. 错
【判断题】
[90]超高压蒸汽在压缩区的用户是C-201和C-501。
A. 对
B. 错
【判断题】
[91]乙烯在空气中的爆炸范围比丙烯在空气中的爆炸范围宽。
A. 对
B. 错
【判断题】
[92]为减少乙烯损失,乙烯精馏塔塔釜循环乙烷要求乙烯含量不超1mol%。
A. 对
B. 错
【判断题】
[93]当出现低温用户冻堵时,应在冻堵上游处注甲醇。
A. 对
B. 错
【判断题】
[94]离心泵启动前需要灌泵。
A. 对
B. 错
【判断题】
[95]复水器的液位控制采用分程调节。
A. 对
B. 错
【判断题】
[96]主蒸汽压力突降或中断会引起压缩机喘振。
A. 对
B. 错
【判断题】
[97]闪点低于45℃的液体为易燃液体。
A. 对
B. 错
【判断题】
[98]丙烯的爆炸极限为2.7%~36%。
A. 对
B. 错
【判断题】
[99]干燥器中分子筛脱水过程为物理吸附过程。
A. 对
B. 错
【判断题】
[100]硫
A. 对
B. 错
【判断题】
[101]工业上脱水(深度干燥)的方法很多,有冷冻法、吸收法和吸附法。现在广泛采用、效果好的方法是用分子筛作为吸附剂的脱水法。
A. 对
B. 错
【判断题】
[102]分子筛是人工合成的结晶性硅铝酸金属盐的多水化合物。
A. 对
B. 错
【判断题】
[103]分子筛是一种离子型极性吸附剂,它
A. 对
B. 错
【判断题】
[104]停开工喷射泵应先关抽汽阀,再关MS阀,切不可颠倒
A. 对
B. 错
【判断题】
[105]液体的沸点与气压的关系很大,气压增大,沸点升高,气压减小,沸点降低。
A. 对
B. 错
【判断题】
[106]乙烯制冷压缩机紧急停车应遵循尽最大的可能保证机组不受损害的原则。
A. 对
B. 错
【判断题】
[107]如果因自身故障C-501停车,C-201也要立即停下来。
A. 对
B. 错
【判断题】
[108]如果因自身故障C-501停车,C-601也要立即停下来。
A. 对
B. 错
【判断题】
[109]调速油主要供给透平的调速机构、主汽阀、抽气止回阀。
A. 对
B. 错
【判断题】
[110]为了使压缩机充分暖机,开车前必须
A. 对
B. 错
【判断题】
[111]C-201润滑油压力低于160KPa引起辅助油泵自启。
A. 对
B. 错
【判断题】
[112]裂解气压缩机复水液面是分程控制的。
A. 对
B. 错
【判断题】
[113]乙烯制冷系统是也一个密闭的循环回路,采用蒸汽透平驱动的四段离心式压缩机。
A. 对
B. 错
【判断题】
[114]在元素周期表中,同一族的元素,从上到下,金属性增强,非金属性减弱。
A. 对
B. 错
【判断题】
[115]催化剂只能改变反应达到平衡的时间,不能使平衡发生移动。
A. 对
B. 错
【判断题】
[116]催化剂将使平衡向正反应方向移动。
A. 对
B. 错
【判断题】
[117]在元素周期表中,同一周期元素,从左到右,金属性逐渐增强,非金属性逐渐减弱。
A. 对
B. 错
【判断题】
[118]如果物质的分子发生了变化,有新物质产生,这样的变化就是化学变化。
A. 对
B. 错
【判断题】
[119]在工厂中所称的“压力”,实际上就是压强。
A. 对
B. 错
【判断题】
[120]离心泵的运行电流与输送量无关.
A. 对
B. 错
【判断题】
[121]换热器传热温差越大,换热能力也越大。
A. 对
B. 错
【判断题】
[122]氢含量越低的原料,其裂解性能越差。
A. 对
B. 错
【判断题】
[123]带支链的烷烃比直链烷烃难裂解。
A. 对
B. 错
【判断题】
[124]含有相同碳原子的二烯烃和炔烃互为同分异构体。
A. 对
B. 错
【判断题】
[125]气体只有在临界温度以下才能液化。
A. 对
B. 错
【判断题】
[126]物质能量低的状态较能量高的状态稳定。
A. 对
B. 错
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Which three descriptions of RADIUS are true? ___
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【多选题】
Which two configurations can prevent VLAN hopping attack from attackers at VLAN 10?___
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【多选题】
What are two features of transparent firewall mode ___
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