热门试题:
[单项选择]当机体缺碘时，最可能引起（）。
A. 夜盲症
B. 甲状腺肿大
C. 佝偻病
D. 大骨节病
E. 癞皮病
[判断题]镶黄旗石材展览馆位于新宝拉格镇。
A.正确
B.错误
[单选题]动车组列车遇本线挂有异物时，如本线降弓可以通过时，司机（ ）。
A.按正常行车方式通过
B.按降弓方式通过
C.立即停车
[多选题]齿轮传动有以下优点( )。
A.效率高
B.结构紧凑
C.传动比恒定
D.工作可靠,寿命长
[单选题]调度票务中心负责批准（ ）施工请销点，主变电所、OCC等区域的C1类施工请销点。
A.A类
B.B类
C.C类
[单项选择]
在以太网的帧结构中，帧首定界符的长度为一个字节，其值为（）。当以太网中数据传输率提高时，帧的传输时间要求按比例缩短，这样有可能会影响到冲突检测。为了能有效地检测冲突，应该（）。当收发两站相距S，光速为C，网络的传输速率为R，发送站的物理层时延为t,则发送站的最小帧长度为（）。在100BaseTX网络中，若两个DTE之间使用了2个中断器，则两个DTE间的最大跨距为（）。
则两个DTE间的最大跨距为（）
A. 100m
B. 175m
C. 200m
D. 205m
[单选题]急性胃炎的发病机制与下列哪项无关
A.前列腺素分泌减少
B.粘液分泌减少
C.胃粘膜屏障破坏
D.氢离子逆向弥散
E.氧合酶活性增强
[单项选择]定量估算工作持续时间的常用方法有( )。
A. 时间定额估算法，三点估计法
B. 时间估算法
C. 三点估算法
D. 时间估算法和三点估算法
[单选题]40.5kV及以上少油断路器泄漏电流的测试仪器主要有成套直流高压发生器和由试验变压器、电容器、(____)等元件构成的组合式直流高压发生器。
A.晶闸管
B.硅堆
C.IGBT
D.三极管
[判断题]头盆不称是导致继发性子宫收缩乏力的最常见原因。
[单选题]关于安全生产违法行为举报制度,以下表述错误的是 ( )
A.负有安全生产监督管理职责的部门应当建立举报制度
B.举报电话、信箱或者电子邮件地址应当公开
C.只有对实名的举报才应当进行调查核实
D.举报事项需要落实整改措施的,报经有关负贵人签字并督促落实
[判断题]采用电话闭塞法组织行车时，占用闭塞区段的行车凭证为路票，区段内的信号机显示视为有效。（ ）
A.正确
B.错误
[判断题]GIS密封性试验,必要时可采用局部包扎法进行气体泄漏测量,以24h的漏气量换算,每一个气室年漏气率不应大于1%, 750kV电压等级的不应大于0.5%
A.正确
B.错误
[多项选择]个人意外风险管理的方法有（）。
A. 加强储蓄
B. 社会救助
C. 社会保险制度
D. 个人意外伤害保险
[判断题]（ ）铁路通信障碍处理要做到“五清”，包括距离清。
A.正确
B.错误
[单选题]发电机着火时，不能用（）灭火
A.泡沫
B.二氧化碳
C.干粉
[单项选择]中国药典规定的注射用水应该是( )
A. 无热原的蒸馏水
B. 蒸馏水
C. 灭菌蒸馏水
D. 去离子水
E. 反渗透法制备的水
[判断题]2.49车辆管理所分为一等、二等、三等和等外四个等级。一等车辆管理所为优秀车辆管理所,等外车辆管理所为不合格车辆管理所。
A.正确
B.错误
[单项选择]抽真空的常用设备是（）。
A. 电动机械泵
B. 蒸汽喷射泵
C. 活塞式抽气机
D. 大功率排气扇
[不定项选择题]共用题干
第二篇
CT Scans and Lung Cancer
Small or slow-growing nodules（小结节）discovered on a lung scan are unlikely to develop into tumors
over the next two years,researchers reported on Wednesday.
The findings,reported in the New England Journal of Medicine,could help doctors decide when to do
more aggressive testing for lung cancer. They could also help patients avoid unnecessarily aggressive and
potentially harmful testing when lesions（损伤）are found.
Lung cancer,the biggest cancer killer in the United States and globally,is often not diagnosed until it
has spread. It kills 159,000 people a year in the United States alone.
The work is part of a larger effort to develop guidelines to help doctors decide what to do when such
growths,often discovered by accident,appear in a scan.
High-tech（高技术的）X-rays called CT scans can detect tumors一but they see all sorts of other blobs
（模糊的一团）that are not tumors , and often the only way to tell the difference is to take a biopsy（活检）,
a dangerous procedure.
At the moment,routine lung cancer screening is considered impractical because of its high cost and
because too many healthy people are called back for further testing.
Good guidelines could help make lung cancer screening practical,Dr. Rob van Kiaveren of the Erasmus
Medical Center in Rotterdam,the Netherlands,who led the new study,said in a telephone interview.
The team looked at 7,557 people at high risk for lung cancer because they were current or former
smokers. All received multidetector（多层螺旋）CT scans that measured the size of any suspicious-looking
nodules.
Volunteers who had nodules over 9.7 mm in width,or had growth of 4. 6 mm that grew fast enough to more
than double in volume every 400 days,were sent for further testing. Of the 196 people who fell into that category,
70 were found to have lung cancer;10 additional cases were found years later.
But of the 7 ,361 who tested negative during screening,only 20 lung cancer cases later developed.
In a second round of screening done one year after the first,1.8 percent were sent to the doctor because they
had a nodule that was large or fast-growing. More than half turned out to have lung cancer.
The result means that if the screening test says you don't have lung cancer,you probably don't,the re-
searchers said."The chances of finding lung cancer one or two years after a negative first-round test were
1 in 1,000 and 3 in 1,000 respectively,"they concluded.
The new study indicates that in case of small or slow-growing lung nodules__________.
A.you cannot be too careful
B.cancer is just a matter of time
C.a biopsy is unnecessary
D.more aggressive testing is a must
[单选题]动车组以外的( )应安装列尾装置。
A.小运转列车
B.旅客列车
C.单机挂车
D.路用列车
[判断题]高处作业应使用工具袋，传送物件使用绳索，可以高空抛物。（ ）
A.正确
B.错误
[单选题]总误差指的是：
A.重复性条件下，对同一测量物进行多次测量所得结果的平均值与被测量的真值之差。
B.测量结果与在重复条件下、对同一被测量物的多次测量所的结果的平均值之差。
C.检测方法与参考方法间浓度差异分布在指定比例所包含的区间。
D.检测结果和正确结果的差异。
[多选题]按照竞争的开放程度不同，施工招标可分为（ ）。
A.内部招标
B.议标
C.公开招标
D.邀请招标
E.社会招标
[单项选择]牛磺酸是由下列哪种氨基酸代谢衍变而来的（）。
A. 蛋氨酸
B. 苏氨酸
C. 半胱氨酸
D. 甘氨酸
E. 谷氨酸
[判断题]化纤绳使用前应进行外观检查，使用中应避免刮磨或与热源接触等。绑扎固定可以用直接系结的方式。
A.正确
B.错误
[单项选择]静脉滴注过快易发生红人综合征的是（）
A. 万古霉素
B. 克林霉素
C. 阿奇霉素
D. 庆大霉素
E. 青霉素
[单选题]重大灾害事故处置时或事后，及时安排（）进行心理干预。
A.救护人员
B.医护人员
C.专业人员
D.消防员
[单选题]( )消防车主要装备曲臂或直曲臂,臂架顶端设有破拆装置,以高空破拆为主要功能的举高消防车。(易)
A.登高平台
B.举高喷射
C.云梯
D.举高破拆
