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[单选题]有限空间内氧浓度应保持在( )(非富氧情况)。
A.23%-38%
B.12.5%-21.5%
C.18%-21%
D.17%-29%

热门试题:

[多选题]下列选项中,属于“唐宋八大家”中的唐朝文学家是( )。
A.韩愈
B.曾巩
C.欧阳修
D.柳宗元
[多选题]根据《电能计量装置现场检验规程》,开展电流互感器首次现场检验的项目有( )。
A.外观检查
B.绝缘试验
C.绕组极性检查
D.基本误差测量
[单项选择]税收与税法的一一对应关系、税收法定原则的普遍采行、征纳双方的合法权利的均衡保障等,都与税收的哪一特征密切相关______
A. 国家主体性
B. 公共目的性
C. 无偿征收性
D. 标准确定性
[判断题]229.信用保证类贷款,借款人能够在扣除首付款之外,提供相当于贷款申请金额60%的流动资产证明,可直接以工薪人士单位出具的收入证明书或自雇人士书面收入声明认定其收入。
A.正确
B.错误
[判断题]各级人民政府应当经常进行道路交通安全教育,提高公民的道路交通安全意识。()。
A.正确
B.错误
[判断题]蓄电池应在发动机起动或低速转动时向发动机点火系及其它用电设备供电。()
[单项选择]孕期出现巨幼细胞性贫血主要是由于缺乏()
A. 维生素B12
B. 泛酸
C. 叶酸
D. 蛋白质
E. 铁
[单项选择]各志愿服务组织对参加志愿者人数达()人以上的活动,应在活动开展10日前向备案的志愿者工作指导中心进行事前活动申报备案。
A. 50
B. 70
C. 80
D. 100
[单选题]企业价值链由主体活动和辅助活动构成,下列企业活动中,属于主体活动的是( )。
A.技术开发
B.采购
C.成品储运
D.人力资源管理
[单项选择] When one of your car tires goes flat, there are two things you can do. Groan and change it or, if you don’’t have a spare, stand helplessly beside the road and hope someone comes to your rescue. Now comes a third alternative, called Quickwheel. It is designed to get disabled motorists rolling again as quickly as possible. Quickwheel is essentially a tiny emergency trailer—complete with three tough little wheels of its own—that supports the flat tire and enables the motorist to drive to a service station without losing much time or expending much energy. The product is manufactured in the Netherlands but is owned and marketed by a U. S. company, Quickwheel Inc. of Greenwich, Connecticut. According to the firm’’s president, Robert Bockweg, the product meets each of the major concerns that consumers associate with flat tires: safety, lost time and physical exertion. To use it, motorists simply unfold the product to its fully extended position, set it in front of the disabled
A. can be used to replace a flat tire
B. provides a kind of temporary support to the flat tire
C. is capable of moving as quickly as a wheel
D. is as flexible and durable as an ordinary wheel
[单项选择]癌症:死亡
A. 上班:下班
B. 下班:上班
C. 犯罪:盗窃
D. 盗窃:犯罪
[单项选择]()是基于无线传输信息的列车控制系统,面向高速新线或特殊线路。
A. CTCS2级
B. CTCS3级
C. CTCS4级
D. LKJ
[填空题]建设单位是建设项目职业病防护设施建设的责任主体。建设项目职业病防护设施必须与主体工程( )、同时施工、同时投入生产和使用
[单项选择]

Why did many people have to move their home
A. They are offered suburban houses.
B. Their houses are above their standard.
C. New buildings will be built in the area.
D. Too many people live in such a small place.
[判断题]公交车自燃前总会有些征兆。如闻到焦糊等异味,立即提醒司机停车检查。
A.正确
B.错误
[多项选择]睡眠诱发中如果不能获得自然睡眠,可以采用药物诱导睡眠,一般选择药物的要求是()
A. 起效时间快
B. 持续时间短
C. 对睡眠结构影响小
D. 起效时间慢
E. 持续时间长
[单项选择]麻疹疫情调查与处置技术指南规定,麻疹暴发是指在一个局部地区,短期内突然出现较多的麻疹病例。下面哪一种情况即应视为麻疹暴发()
A. 以乡(镇、社区、街道)为单位7日内发生5例及以上麻疹病例
B. 以村、居委会、学校或其他集体机构为单位在10日内发生2例及以上麻疹病例
C. 以县为单位、一周内麻疹发病水平超过前3年同期平均发病水平1倍以上
D. 上一年度麻疹发病率<1/100万的县、发现单例麻疹病例
E. 上一年度麻疹发病率<3/100万的县、发现单例麻疹病例
[单项选择]女性卵巢功能成熟,生育能力最旺盛的时期是()
A. 幼年期
B. 青春期
C. 性成熟期
D. 更年期
E. 老年期
[判断题]饭店中经济类客房与标间是一样的,只是供三人以上使用,经济实惠。
[单项选择]TEXT B For office innovators, the unrealized dream of the "paperless" office is a classic example of high-tech hubris (傲慢). Today’s office drone is drowning in more paper than ever before. But after decades of hype, American offices may finally be losing their paper obsession. The demand for paper used to outstrip the growth of the US economy, but the past two or three years have seen a marked slowdown in sales - despite a healthy economic scene. Analysts attribute the decline to such factors as advances in digital databases and communication systems. Escaping our craving for paper, however, will be anything but an easy affair. "Old habits are hard to break." says Merilyn Dunn, a communications supplies director. "There are some functions that paper serves where a screen display doesn’t work. Those functions are both its strength and its weakness." In the early to mid-’90s, a booming economy and improved desktop printers helped boost paper sales by 6 to 7 percent each year. The co
A. Workforce with better computer skills.
B. Slow growth of the US economy.
C. Changing patterns in paper use.
D. Changing employment trends.
[判断题]根据《公安机关办理刑事案件程序规定》的规定,询问证人、被害人,可以到证人、被害人所在单位、住处或者公安机关提出的地点进行。
[单选题]急性呼吸窘迫综合征给氧的浓度为 ( )
A.21%~28%
B.29%~38%
97
C.39%~50%
D.>50%
[单选题]
以下不属于税务公文种类的是()。
A.批复
B.请示
C.通知
D.汇报
[判断题]停电检修的线路如在另一回线路的上面,而又必须在该线路不停电情况下进行放松或架设导、地线以及更换绝缘子等工作时,要有防止导、地线脱落、滑跑的后备保护措施。( )
A.正确
B.错误
[单选题]用户用电设备的变更,应经过( )审核。
A.供电单位
B.设计单位
C.施工单位
D.产权单位
[判断题]雷电时,因工作需要可以测量线路绝缘。( )
A.正确
B.错误
[简答题]宣子骤谏。公患之,使钮魔贼之。晨往,寝门闻矣。盛服将朝,尚早,坐而假寐。魔退,叹而言日:“不忘恭敬,民之主也。贼民之主,不忠;弃君之命,不信,有一于此,不如死也。”触槐而死。试分析(晋灵公不君)组麂这一人物的性格。
[单选题]663. 关于仪表电缆电线屏蔽层的使用错误的是( )。
A.可以多侧接地
B.应在控制室仪表盘柜侧接地
C.同一回路的屏蔽层应具有可靠的电气连续性
D.同一回路的屏蔽层不应浮空或重复接地
[单项选择]Dalton wondered why the heavier and lighter gases in the atmosphere did not separate as oil and water do. He finally concluded that the constituent (61) must exist in the form of tiny particles or atoms and that these (62) be completely mixed together in the atmosphere. This threw a new light in (63) law of definite proportions. It was only necessary to suppose that the atoms (64) combine into small groups of uniform (65) and so form more complex substance; (66) the mystery of this law was (67) . Dalton suggested, for example, that carbon monoxide (68) formed by the one with one (69) of atoms of carbon and oxygen, (70) carbon dioxide results from a single (71) of carbon uniting with two atoms of oxygen. Assuming this to be true, (72) the definite proportions of Prout’s law (73) all chemical compounds the different constituents (74) enter in unvarying proportions wo
A. putting
B. pairing
C. placing
D. preparing
[单项选择]从法律角度看,保险是一种合同行为,是一方同意补偿另一方损失的一种合同安排,提供损失赔偿的一方是保险人,接受损失赔偿的另一方是()。
A. 代理人
B. 委托人
C. 被保险人
D. 受益人
[多选题]灭火战斗中,指挥员必须迅速确定火场的主要方面,应把握( )。
A.当火场上有人受到火势严重威胁时,抢救人命是火场的主要方面。
B.当火场上有贵重的仪器设备、技术资料、图书档案等受到火势威胁,有可能造成重大经济损失和严重政治影响时,保护和疏散贵重物资和重要资料是火场的主要方面。
C.当火场内的压力容器、爆炸性、毒性、腐蚀性和放射性等危险化学品受到火势严重威胁,有可能发生爆炸,造成人员伤亡、建筑倒塌、设备损坏等险情时,消除这些险情是火场的主要方面
D.当已经发生爆炸,且连续不断,控制爆炸是火场的主要方面
[简答题]简述矽肺的诊断原则和方法。
[单选题]《安全生产违法行为行政处罚办法(2015修正)》,有从轻处罚情节的,应当在法定处罚幅度的( )确定行政处罚标准,但不得低于法定处罚幅度的下限。
A.A.高档以下、中档以上
B.B.中档
C.C.中档以下
D.D.低档
[单选题]电力电缆线路防止过电压设备有()。
A.护层电压限制器
B.电压互感器
C.电流互感器
D.避雷针。
[单项选择]
Reading for Pleasure

The first thing I want to insist on is that reading should be enjoyable. Of course, there are many books that we all have to read, either to pass examinations or to acquire information, from which it is impossible to extract enjoyment. We are reading them for instruction, and the best we can hope is that our need for it will enable us to get through them without tedium. Such books we read unwillingly rather than willingly. But that is not the sort of reading I have in mind. The books I shall mention in due course will help you neither to get a degree nor to earn your living, they will not teach you to sail a boat or run a stopped motor, but they will help you to live more fully. However, they cannot do unless you enjoy reading them.
Every man is his own best critic. Whatever the learned say about a book, however unanimous they are in their praise of it, unless it interests you, it is no business o
A. Right
B. Wrong
C. Not mentioned

[单项选择]下列关于血脂异常临床分型的叙述,不正确的是()。
A. 高三酰甘油血症主要为TG升高,而TC正常或轻度增加
B. 高胆固醇血症TC增高,TG正常
C. 混合型高脂血症TC和TG均增高
D. 低高密度脂蛋白血症TC水平明显增高,TG正常或偏高
E. 低高密度脂蛋白血症HDL-C降低

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