什么是放射性本底？-我要搜题网

[判断题]信用风险带来的损失也可能发生在实际违约之前，当交易对手的履约能力即信用质量发生变化时，也会存在潜在的损失，因此信用风险不是只有当违约实际发生时才会产生。

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[单选题]CRH380B型动车组司机室空调系统主要部件为冷凝器装置，位于驾驶室的。
A.底板区域
B.配电柜
C.司机室设备舱
D.顶板区域

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[填空题]热力学温度与摄氏温度之间的关系式是__()__,式中T的单位名称是开尔文,T的单位符号为__()__

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[判断题]电缆沟的盖板开启后，应自然通风一段时间，经检测合格后方可下井沟工作。
A.正确
B.错误

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[单选题]下列意识障碍中，属最轻度的是
A.烦躁
B.昏睡
C.嗜睡
D.浅昏迷
E.意识模糊

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[名词解释]蔡伦Cài Lún

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[判断题]制动作用沿列车由前向后依次发生的这种传播叫制动波速。
A.正确
B.错误

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[简答题]Undergraduate employment Analysis case study

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[单项选择]A国某公司2011年度国内应纳税所得额1200万元，B国分公司的应纳税所得额500万元。A国所得税实行超额累进税率，年所得100万元以下的部分，税率为25%；超过100万元至820万元的部分，税率为35%；超过820万元的部分，税率为45%；B国所得税实行30%的比例税率。假定A国采用全额免税法，则该公司在A国应缴纳的所得税为( )万元。
A. 208
B. 266
C. 364
D. 448

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[单项选择]患者男，17岁，因“无青春期发育”来诊。查体：身高175cm，臂展超过身长，皮肤无色素沉着，无胡须和喉结，无乳腺发育，无腋毛，阴毛少许，睾丸容量约4ml，质软，阴茎长约4cm。最可能的诊断是哪个（）。
A. Klinefelter综合征
B. 低促性腺激素性腺功能减退症
C. Turner综合征
D. 先天性肾上腺皮质增生
E. 心肌炎

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[单选题]索道禁止超载使用，禁止载（　　）。
A.物品
B.人
C.设备
D.工器具

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[简答题]列车发生火灾、爆炸需要分隔甩车时，应如何处理？

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[简答题]泡沫供给强度是什么？

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[判断题]在控制中心设置的通信扩展模块中，有一个接口用于和时钟系统连接，接收时钟系统的时间信息，同步本系统的时间。

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[单项选择]在2000年WHO血液肿瘤分型，将急性白血病诊断中骨髓原始细胞的数量规定为大于（）
A. 10％
B. 15％
C. 20％
D. 25％
E. 30％

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[简答题]为什么苯酚要重蒸饱和后才能用于 DNA的分离？

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[填空题]There are about 105 males born for every 100 females, but this (36) drops to near balance at the age of maturity, and among 70-year olds there are twice as many women as men. But the great universal of male (37) is being changed. Now, boy babies (38) almost as well as girls do. Fifty years ago, the chance of a baby(particularly a boy baby)surviving depended on its weight. A kilogram too light or too heavy (39) almost certain death. Today it makes almost no (40) . Since much of the variation is due to genes, one more agent of evolution has gone.
There is another way to (41) evolutionary suicide: stay alive, but have fewer children. Few people are as (42) as in the past. Nowadays the number of births, like the age of death, has become (43) .Again, (44) .
For us, this means that evolution is over; the biological Utopia has arrived. Strangely, it has involved little physical change. No other spe

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[单项选择]Passage Two Overhead bridges are found in many parts of Beijing, especially in places where traffic is very heavy and crossing the road is dangerous. The purpose of these bridges is to enable pedestrians (行人) to cross roads safely. Overhead bridges are used to very much the same way as zebra crossings. They are more efficient (效率高的) although less convenient because people have to climb up a long flight of steps. This is inconvenient especially to older people. When pedestrains use an overhead bridge, they do not hold up traffic. However, when they cross a busy road using a zebra crossing, traffic is held up. This is why the government has built many overhead bridges to help pedestrians and to keep traffic moving at the same time. The government of Beijing has spent a large amount of money on building these bridges. For their own safety, pedestrians should be encouraged to use them instead of risking (冒…危险) their lives by dashing across the road. Old people , however , ma
A. Overhead bridges are found in every part of Beijing.
B. Overhead bridges are only found in the centre of Beijing.
C. Overhead bridges are found in many parts of big cities in China.
D. Overhead bridges are found in places where traffic is heavy.

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[单选题]以下关于职业选择的说法中,正确的是( )。
A.职业选择是个人的事,与社会发展要求无关
B.人们有选择职业的自由,但不等于可以随心所欲地选择职业
C.职业选择自由与“干一行、爱一行、专一行”相矛盾
D.树立职业理想容易导致人们在择业上不顾社会需求

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[单选题]对远视眼的错误叙述有 ( )
A.由于眼球前后径过短所致
B.平行光线聚焦于视网膜之前
C.看远物时需要调节
D.近点移远

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[判断题]所有矿井采区避灾路线上均应敷设压风管路，并设置供气阀门，间隔不大于200m。
A.正确
B.错误

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[多选题]发生（）情形，列为一般C类事故。
A.调车脱轨
B.列车运行中刮坏行车设备设施
C.列车火灾
D.挤道岔

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[判断题]"先秦时期"，这是奴隶制生产方式和奴隶制上层建筑占主导地位的时期。（）

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[判断题]卸料平台固定点和上部拉接点支撑点应设置在稳定的主体结构上,且应可靠连接;严禁将操作平台设置在临时设施上。
A.正确
B.错误