未分类题

背景资料
某大型往复活塞式压缩机安装工程按设计文件要求全部完成后，进入单机试运行阶段。试运行项目部做了如下准备工作：(1)试车范围内的工程已按设计文件的内容和有关规范的质量标准全部完成，并提供了相关资料和文件；(2)试车方案已经批准；(3)试车组织已经建立，试车操作人员经过培训学习、考试合格，熟悉试车方案和操作方法，能正确操作；(4)测试仪表、工具、记录表格齐全，保修人员就位。
在该压缩机空负荷试运行中，运行人员检查发现冷却系统、润滑系统的启动和运转正常，压缩机空负荷运转时间最长的一次达到100min。
进入压缩机空气负荷试运行后，业主即刻开展升压运转，排气压力分别升至额定压力的25%、50%、75%和100%。运转中油压保持0.l0MPa，曲轴箱或机身内润滑油的温度均低于70汇。
问题
试运行项目部所做的准备工作是否有缺项?请说明。

A.l0MPa，曲轴箱或机身内润滑油的温度均低于70汇。
问题
试运行项目部所做的准备工作是否有缺项?请说明。

【参考答案】

有缺项。依据单体试运行前必须具备的条件有：1)试运行范围内的工程已按设计文件的内容和有关规范的质量标准全部完成并提供了相......

(↓↓↓ 点击下方‘点击查看答案’看完整答案 ↓↓↓)

<上一题目录下一题>

热门试题

单项选择题

给出下列结论：1）在回归分析中，可用指数系数R2的值判断模型的拟合效果，R2越大，模型的拟合效果越好；2）在回归分析中，可用残差平方和判断模型的拟合效果，残差平方和越大，模型的拟合效果越好；3）在回归分析中，可用相关系数r的值判断模型的拟合效果，r越小，模型的拟合效果越好；4)在回归分析中，可用残差图判断模型的拟合效果，残差点比较均匀地落在水平的带状区域中，说明这样的模型比较合适．带状区域的宽度越窄，说明模型的拟合精度越高。以上结论中，正确的有（）个．A. 1B. 2C. 3D. 4

未分类题

Sitting in stationary traffic is, at best, a Zen experiencE.Drivers mired in a jam learn to cede control to the powers that be, becoming at one with the universe as they breathe in the mind-numbing fumes all arounD.At worst, it is an on-going battle for sanity. But now, according to several groups of researchers in America and Germany, there is something that drivers can do to take back control over the roads. Get adaptive cruise control. And, of course, use it.Adaptive cruise control (ACC) , as its name suggests, is a modified version of traditional cruise control. It employs radar to monitor the road ahead of a vehicle, automatically adjusting that vehicle' s speed to maintain a safe distance from the one in front. This is safer than manual driving because it reduces the system' s reaction time from nearly a second (human) to practically instantaneous (machine) , thus helping to forestall shunts. But ACC may have a useful side-effect, arising from the fact that another effect of slow human reaction times is to produce traffic jams on apparently open roads.Such jams start when a car slows suddenly to allow, for example, another vehicle to enter the traffic stream. Slow reaction times mean that instead of responding smoothly, the drivers behind such a vehicle often end up slamming on the brakes. That skimming propagates backwards, and before long (he traffic is at a standstill. So it makes sense that ACC would reduce not only collisions, but also congestion. What is unexpected is how few vehicles need to have it operating for all to benefit. As Craig Davis of the University of Michigan reports in Physical Review E, only 20% of cars need to employ ACC in order to present completely those jams that are caused by a slow lead car on a high-speed, single-lane roaD.According to Dr. Davis' s computer model, even a rate of use of ACC as low as 13% can improve the flow of traffic significantly.ACC is not a panaceA.Dr. Davis got less promising results for more complex, road conditions, particularly those near junctions. And a .similar model built by Boris Kernel', a researcher for Daimler Chrysler, in Stuttgart, Germany, indicates that in certain bottleneck conditions, ACC may even cause extra congestion. These disappointing results can, however, be ameliorated by shortening the 'headway' in ACC-equipped vehicles, according to Martin. Treiber of the Dresden University of Technology', also in Germany.Headway is the gap, measured in seconds, that a driver puts between himself and the car aheaD.Since ACC reacts more quickly than a human, people who have it fitted can afford to allow less headway.Summary :Stationary traffic can drive people maD.However, according to American and German researchers, adaptive cruise control (ACC) can help drivers take【71】. ACC adapts a car's speed to keep a sale distance from the one ahead by using radar to monitor the road aheaD.ACC is safer than manual driving because is significantly reduces the system's【72】, and collisions and congestion in addition. According to Dr. Davis' computer model, if【73】of cars use ACC, the flow of traffic can be improved significantly. However, ACC should not be seen as a panaceA.In【74】conditions, it may even cause extra jams, according to a computer model. But this situation can be improved by reducing【75】in ACC-equipped vehicles.(30)

A.B.
C.
D.similar
E.
F.
G.
(30)