充值vip 上传试卷赚钱
快速导航
学历类
职业资格
公务员
医卫类
建筑工程
外语类
外贸类
计算机类
财会类
技能鉴定
特种作业
安全生产
医疗药物
交通相关
科技类
食品类
服务行业
健康护理
其他类
当前位置：考试网  > 试卷库  > 技能鉴定  > 其他类  > 石油石化职业技能鉴定  >  金属材料的主要性能包括哪些？
试题预览

金属材料的主要性能包括哪些？

查看答案
收藏
纠错
正确答案：

等力学性能有强度、硬度、弹性、工艺性能指可铸性、可煅性、可焊性。

提高压缩比，增高压缩终了的压力，提高发体过浓。适当加大空气量孔，以改善混合气的形成。区行驶车辆的发动机性能。

答案解析：

暂无解析

上一题 下一题
你可能感兴趣的试题

香江茶艺中“温润泡”的目的是

查看答案

按照劳动关系主体各方的力量对比划分，不属于劳动关系类型的是

查看答案

对于判定结果为通过现场核查的，申请人应当在（）内对现场核查中发现的问题进行整改，并将整改结果向负责对申请人实施食品安全日常监督管理的食品药品监督管理部门书面报告。

查看答案

按照销路分类是贸易和命名上的习惯，一般分为

查看答案

茶艺从业人员的（）是社会主义道德基本原则在茶艺服务中的具体体现，是评价茶艺从业人员职业行为的总准则。

查看答案
热门试题 更多>
什么是兼容性测试?兼容性测试侧重哪些方面?
试题分类： 计算机四级
练习次数：0次
Cigna Insurance Company offers employees the option of placing take-out meal orders with the company chef.
试题分类： 初级(口语)
练习次数：0次
常见的几种约束有哪些?分别代表什么意思?如何使用?
试题分类： 计算机二级
练习次数：0次
.For the sake of our long-term friendship ,we are going to accept the price reduction on the radios. How about 6% off?
试题分类： 口语
练习次数：0次
数据库系统处理死锁一般采用哪两类方法?简述每类方法的基本原理
试题分类： 计算机四级
练习次数：0次
In some cultures old people are more valued, while in other cultures the youth is more valued. Discuss both these views and give your own opinion.
试题分类： 写作
练习次数：0次
温室气体的增多加剧了温室效应。
试题分类： 口语
练习次数：1次
Safety inspection
试题分类： 初级(口语)
练习次数：0次
Many people think that arts (painting and music) do not directly improve people's life, so the government should spend money on other important areas. Do you agree or disagree?
试题分类： 写作
练习次数：0次
1.The failure of a high-profile cholesterol drug has thrown a spotlight on the complicated machinery that regulates cholesterol levels.But many researchers remain confident that drugs to boost levels of 'good' cholesterol are still one of the most promising means to combat spiralling heart disease. 2.Drug company Pfizer announced on 2 December that it was cancelling all clinical trials of torcetrapib，a drug designed to raise heart-protective high-density lipoproteins (HDLs).In a trial of 15000 patients，a safety board found that more people died or suffered cardiovascular problems after taking the drug plus a cholesterol-lowering statin than those in a control group who took the statin alone. 3.The news came as a kick in the teeth to many cardiologists because earlier tests in animals and people suggested it would lower rates of cardiovascular disease."There have been no red flags to my knowledge," says John Chapman，a specialist in lipoproteins and atherosclerosis at the National Institute for Health and Medical Research (INSERM) in Paris who has also studied torcetrapib."This cancellation came as a complete shock." 4.Torcetrapib is one of the most advanced of a new breed of drugs designed to raise levels of HDLs，which ferry cholesterol out of artery-clogging plaques to the liver for removal from the body.Specifically，torcetrapib blocks a protein called cholesterol ester transfer protein (CETP)，which normally transfers the cholesterol from high-density lipoproteins to low density，plaque-promoting ones.Statins，in contrast，mainly work by lowering the 'bad' low-density lipoproteins. Under pressure 5.Researchers are now trying to work out why and how the drug backfired，something that will not become clear until the clinical details are released by Pfizer.One hint lies in evidence from earlier trials that it slightly raises blood pressure in some patients.It was thought that this mild problem would be offset by the heart benefits of the drug.But it is possible that it actually proved fatal in some patients who already suffered high blood pressure.If blood pressure is the explanation，it would actually be good news for drug developers because it suggests that the problems are specific to this compound.Other prototype drugs that are being developed to block CETP work in a slightly different way and might not suffer the same downfall. 6.But it is also possible that the whole idea of blocking CETP is flawed，says Moti Kashyap，who directs atherosclerosis research at the VA Medical Center in Long Beach，California.When HDLs excrete cholesterol in the liver，they actually rely on LDLs for part of this process.So inhibiting CETP，which prevents the transfer of cholesterol from HDL to LDL，might actually cause an abnormal and irreversible accumulation of cholesterol in the body."You're blocking a physiologic mechanism to eliminate cholesterol and effectively constipating the pathway," says Kashyap.Going up 7.Most researchers remain confident that elevating high density lipoproteins levels by one means or another is one of the best routes for helping heart disease patients.But HDLs are complex and not entirely understood.One approved drug，called niacin，is known to both raise HDL and reduce cardiovascular risk but also causes an unpleasant sensation of heat and tingling.Researchers are exploring whether they can bypass this side effect and whether niacin can lower disease risk more than statins alone.Scientists are also working on several other means to bump up high-density lipoproteins by，for example，introducing synthetic HDLs."The only thing we know is dead in the water is torcetrapib，not the whole idea of raising HDL," says Michael Miller，director of preventive cardiology at the University of Maryland Medical Center，Baltimore. Questions 7-13 Match torcetrapib，HDLs，statin and CETP with their functions (Questions 8-13)..Write the correct letter A，B，C or D in boxes 8-13 on your answer sheet.NB You may use any letter more than once. 7.It has been administered to over 10,000 subjects in a clinical trial. 8.It could help rid human body of cholesterol. 9.Researchers are yet to find more about it. 10.It was used to reduce the level of cholesterol. 11.According to Kashyap，it might lead to unwanted result if it's blocked. 12.It produced contradictory results in different trials. 13.It could inhibit LDLs.List of choices A.TorcetrapicB.HDLSC.StatinD.CETP
试题分类： 阅读
练习次数：3次
相关题库 更多>
园林绿化作业人员 冶金工业技能鉴定 烟草职业技能鉴定 消防职业技能鉴定 文化教育职业技能鉴定 土木工程建筑施工 体育职业技能鉴定 四小证 水利设施管养人员 收银审核员 石油石化职业技能鉴定 三种人考试 燃气职业技能鉴定 汽车技师职业鉴定
新手指南
会员服务
服务支持
扫一扫，手机做题