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[单选题]一定温度下,某流体的密度ρ为1Kg/m3,则某流体的相对密度为( )。
A.1/ρ
B.103
C.103ρ
D.10-3ρ

热门试题:

[单项选择]Questions 11 to 14 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions.
Now, listen to the passage.

When Rod Laver got behind, he would
A. play a "safe" game.
B. become nervous.
C. forget what the score was.
D. play a relaxed game.
[单选题]气体灭火系统两个或两个以上的防护区采用组合分配系统时,一个组合分配系统所保护的防护区不应超过“ ”个。
A.6
B.7
C.8
D.9
[多选题]在满足客流需求、适应城市轨道交通网络化运行的前提下,应根据( )等选型要素来正确地选用车辆的类型。
A.客流特点
B.客流量
C.行车速度
D.供电制式
E.线路条件
[简答题]运用改革开放和现代化建设成就,利用驻地红色资源和主流媒体优质教育资源,参观爱国主义教育基地、各种纪念场馆,发挥政府专职消防员亲属和家乡政府的积极影响,借助社会、家庭教育资源进行共教共育。
[多项选择]内镜手术设计切口入路时应考虑下列一些因素()。
A. 内镜的范围
B. 审美考虑
C. 轮廓约束
D. 功能性考虑
[单项选择]抽查焊缝中,不合格者超过(),应加倍探伤,不合格时则须全部探伤。
A. 50%
B. 30%
C. 20%
D. 10%
[判断题]差别感觉阈限与差别感受性之间的关系呈正比关系。
[多选题]地震按照其成因分为()和()。
A.天然地震
B.人为地震
C.构造地震
D.火山地震
[简答题]为防止第一类危险源导致事故,必须采取防控措施。一旦这些防控措施失效(故障),则将发生事故。失效的防控措施,属于()。河岸护坡、防护网、挡墙失效等。
[判断题] 锰钢辙岔上的导电销日常由工务检查、保养,脱落时,由工务部门通知并配合电务焊修。
A.正确
B.错误
[单选题]撒漏的金属钠收集后,应浸入( )中。
A.冷水
B.煤油
C.石灰水
D.溶剂油
[单项选择]地西泮首选用于()
A. 癫痫大发作
B. 抑郁症
C. 精神分裂症
D. 慢性疼痛
E. 催眠
[判断题]根据国家赔偿法的规定,赔偿请求人根据受到的不同损害,可以同时提出数项赔偿要求。 ( )
A.正确
B.错误
[单选题]新195和190型柴油机是通过增减喷油泵与机体之间的铜垫片来调整供油提前角的;减少垫片供油时间变(  )。
A. A、晚
B.B、早
C.C、先早后晚
D.D、先晚后早
[判断题]防烟楼梯间均应设机械防烟设施。
A.正确
B.错误
[多选题] 对需进行伤情鉴定的案件,(),公安机关应当将有关情况记录在案,并可以根据已认定的事实作出处理决定
A. 被侵害人拒绝提供诊断证明的
B. 被侵害人拒绝进行伤情鉴定的
C. 被侵害人无法提供诊断证明的
D. 经公安机关通知,被侵害人无正当理由逾期不作伤情鉴定的
[单项选择]防水混凝土的()必须符合设计要求。
A. 强度等级
B. 抗渗等级
C. 抗压强度和抗渗压力
D. 外观质量
[多项选择]下列关于信托终止的法律效果的说法正确的是( )。
A. 依照《中华人民共和国信托法》第五十四条的规定,信托财产的归属确定后,在该信托财产转移给权利归属人的过程中,信托视为存续,权利归属人视为受益人
B. 信托终止后,人民法院依法对原信托财产进行强制执行的,以原受托人为被执行人
C. 信托终止后,受托人依照《中华人民共和国信托法》规定行使请求给付报酬、从信托财产中获得补偿的权利时,可以留置信托财产或者对信托财产的权利归属人提出请求
D. 信托终止的,受托人应当作出处理信托事务的清算报告
[单选题] 年北京奥运会上,中国体育代表团639名运动员参加了28个大项,262个小项的比赛。获得(  )枚金牌、21枚银牌、28枚铜牌,创4项世界纪录,这是中国参加奥运会历史上最好的成绩。
A.51
B.41
C.31
D.21
[单项选择]迄今发现于我国境内最早的古人类是( )。
A. 北京人
B. 山顶洞人
C. 丁村人
D. 元谋人
[判断题]根据《大型飞机公共航空运输承运人运行合格审定规则》,没
有阅读能力,但能够准确理解机组关于应急撤离指示与相关命令的 能力的旅客,不影响其在出口座位就座。
A.正确
B.错误
[单项选择]环境湿度过大或颗粒不干燥可造成()
A. 松片
B. 粘冲
C. 片重差异超限
D. 片剂含量不均匀
E. 崩解迟缓
[单选题]关于10086误取消虚拟网,若涉及虚拟网当月计次计费,产生额外费用,可按( )进行退费处理
A.包月折算
B.双倍退费
C.单倍退费
D.全额退费
[多选题]动触头的运动速度中影响断路器工作性能最重要的是( )
A.平均速度
B.刚分速度
C.刚合速度
D.最大速度
[单项选择]机器基本上是由()、工作部分和传动装置三部分组成。
A. 主动部分
B. 从动部分
C. 动力部分
D. 零部件
[单项选择]与儿童佝偻病关系较密切的营养素有()
A. 铁、碘
B. 氯化钾、必需脂肪酸
C. 钙、维生素D
D. 葡萄糖、必需氨基酸
E. 锌、铁
[单项选择]巡回画派的代表作家是______。
A. 米勒
B. 列宾
C. 塞尚
D. 莫奈
[不定项选择题]共用题干 Learn About Noble Gases(惰性气体)

1 Have you ever ridden on a balloon?Many tourist spots offer balloon rides in order for people to see
the beauty of a place from above.A balloon contains a noble gas called helium(氦).Formerly,balloons con-
tamned hydrogen but hydrogen is very flammable and dangerous when uncontrolled.Therefore,people shifted
to helium,which is safer. Helium is safe because it has the properties of the noble gases.
2 People once believed that noble gases couldn't chemically react at all.For this reason,they were
called inert gases(隋性气体).They were also listed under Group 0 in the old periodic table because scien-
tists believed that the gases have zero valence(价)electrons in their outer shell.This was later proven to be
untrue when some noble gas compounds were discovered.
3 The gases are elements,which share similar properties.These properties include being monoatomic,
colorless,odorless,being able to conduct electricity,and having low chemical reactivity.Noble gases
include helium,neon,argon,krypton,xenon and radon.These are all found in Group 18,in the right most
column of the periodic table.If you look at the periodic table,you will notice that these elements are the only
ones which do not have a charge. Helium has the lowest molecular(分子的)weight while radon is the
heaviest.
4 Remember that chemical reactions occur because atoms have valence electrons,which are electrons
in their outer shell.When the outer shell is"unfilled"or the required number of electrons is not yet com-
plete,the atom is more reactive.Noble gases have a full outer shell,meaning that they have complete elec-
trons in their outer shell.This complete number varies.For instance,the outer shell of helium has 2 valence
electrons while the outer shell of xenon has 8 electrons.Nowadays,there remains to be a few noble gases
because of the low chemical reactivity of these said gases.
5 because of their properties,noble gases have many important applications.They are widely used in
medicine and industries. For instance , liquid helium is used for superconducting magnets(磁体).These
magnets are very important in physics and medicine.When a doctor suspects that a person's brain has been
damaged,he might request for Magnetic Resonance Imaging(MRI).MRI allows the doctor to"see"the
brain,without operating on the patient. Noble gases are not very chemically__________.
A.reactive
B.lightest
C.important
D.complete
E.flammable
F.unnecessary
[填空题] You will hear five different business people talking about corporations. For each extract there are two tasks. For Task One, choose the advantage of corporations described from the list A—H. For Task Two, choose the disadvantage of corporations from the list A—H. You will hear the recording twice.
[多项选择]下列构件中()是属于通风系统配件。
A. 风口
B. 阀门
C. 天圆地方
D. 弯头
E. 三通
[单选题]单选题 Je3A3111
437878线路损失率即为线路损失电量占()的百分比。
A.供电量
B.售电量
C.用电量
D.设备容量
[判断题]根据《居住区室外工程建设标准》(DB/64T1744-2020),采用水平定向钻敷设的燃气管道,吹扫、强度试验和严密性试验应在敷设前单独进行。
A.正确
B.错误
[单项选择]
{{B}}TEXT B{{/B}}

There must be few questions on which responsible opinion is so utterly divided as on that of how much sleep we ought to have. There are some who think we can leave the body to regulate these matters for itself. "The answer is easy," says Dr. A. Burton. "With the tight amount of sleep you should wake up fresh and alert five minutes before the alarm tings." If he is right many people must be under sleeping, including myself. But we must remember that some people have a greater inertia than others. This is not meant rudely. They switch on Slowly, and they are reluctant to switch off. They are alert at bedtime and sleepy when it is time to get up, and this may have nothing to do with how fatigued their bodies are, or how much sleep they must take to lose their fatigue.
Other people feel sure that the present trend is towards too little sleep. To quote one medical opinion, "Thousands of people drift through life s
A. few people can wake up feeling fresh and alert
B. some people still feel tired with enough sleep
C. some people still feel sleepy with enough sleep
D. some people go to bed very late at night
[判断题]判断题矿山、建筑施工单位和危险物品的生产、经营、储存单位,从业人员超过一百人的,应当设置安全生产管理机构或者配备专职安全生产管理人员;从业人员在一百人以下的,应当配备专职或者兼职的安全生产管理人员,或者委托具有国家规定的相关专业技术资格的工程技术人员提供安全生产管理服务。()
A.正确
B.错误
[单选题]公募基金产品风险最高的是( )。
A.A.股票型
B.B.混合型
C.C.债券型
D.D.货币型
[单选题]根据201 1年新版的《医疗机构药事管理规定》,二级医院临床药师不少于几名
A.1
B.3
C.5
D.8
[名词解释]超导体

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