热门试题:
[多选题]门静脉高压症病人术前饮食护理要注意:
A.避免油炸、干硬、粗糙的食物
B.给予高糖、低蛋白、低脂肪、易消化的饮食
C.避免进食过热的食物
D.避免有骨刺的食物
E.给予高糖、高维生素、高蛋白、低脂肪、易消化的饮食
[单项选择]刘某将自己的汽车向某保险公司投保财产损失险,附加盗抢险,保险金额按车辆价值确定为20万元。后该汽车被盗,在保险公司支付了全部保险金额之后,该车辆被公安机关追回。关于保险金和车辆的处置方法,下列选项正确的是( )。
A. 甲无需退还受领的保险金,但车辆归保险公司所有
B. 车辆归甲所有,但甲应退还受领的保险金
C. 甲无需退还保险金,车辆应归甲所有
D. 应由甲和保险公司协商处理保险金与车辆的归属
[填空题]分散自律车站操作的高铁车站,以CTC系统( )、人工触发进路为主。
[单选题]治疗病毒性心肌炎时下列哪项不是选用糖皮质激素的适应证
A.房室阻滞
B.难治性心力衰竭
C.心源性休克
D.存在自身免疫病
E.窦性心动过速
[多选题]影响施工质量的因素主要包括五大方面:( )、方法和环境。在施工过程中对这五方面因素严加控制是保证工程质量的关键。
A.人员
B.设备
C.机械
D.材料
E.规程
[判断题]非专业持证人员,不得开展潜水作业。必须编队潜水,不得单独作业。
A.正确
B.错误
[单项选择]尽管电子秤在设计、制造过程中已采用了防震措施,但过大的碰撞将使()受到损伤,影响其准确度。
A. 电路
B. 传感器
C. 读数盘
D. 指针
[单选题]42#岸桥大车每腿车轮数为( )个。
A.2
B.4
C.6
D.8
[单项选择]在字符用户界面下,需要键入何种指令才能进入图形界面(X window):()。
A. X
B. startx
C. xwindow
D. getinto
[单选题]防爆设备的安全检查和维护必须是专业的、带有强制性的( )检查。
A.专项
B.行政性
C.综合性
D.日常性
[单选题]等电位作业人员转移电位时,人体裸露部分与带电体的距离,110、220千伏不应小于()米。
A.0.2
B.0.3
C.0.4
D.0.5
[简答题]负极合浆,SBR投料时,直接从桶内倒入预混罐中即可()。
[单选题]上级消防救援机构对下级消防救援机构的消防监督检查工作不负有( )职责。
A.监督
B.组织实施
C.检查
D.指导
[单选题]骨的构造( )
A.每块骨都有骨髓
B.每块骨都有关节软骨
C.骨膜包裹每块骨整个骨面
D.黄骨髓、红骨髓都能造血
E.黄骨髓、红骨髓均不能互相转化
[单项选择]有关孕期卫生下述哪项不正确()
A. 孕期饮食应多样化
B. 孕早期,激素、抗生素应禁用或慎用
C. 孕晚期应取仰卧位
D. 妊娠最后2个月避免盆浴
E. 妊娠头3个月、后2个月禁止性生活
[单选题]在下列直流稳压电路中,效率最高的是( )。
A.串联型稳压电路
B.开关型稳压电
C.并联型稳压电路
D.硅稳压二极管稳压电路
[多项选择]注册咨询工程师(投资)应当是复合型人才,其知识结构应该具有多学科、多领域的特点,基本包括( )。
A. 专业技术知识
B. 管理科学基础知识
C. 经济学基础知识
D. 外语水平
E. 公关能力
[判断题]—年,国家按照“市场定价、价补分离”的原则,启动粮食等重要农产品市场化收购加补贴的收购体制改革。
A.正确
B.错误
[单选题] 对火焰的防护方法表述错误的是( )。(中)
A.扑救易燃液体火灾时,消防员宜在流淌的易燃液体中行走搅动,使泡沫覆盖充分
B.扑救室内火灾开门前,可用手背先测试房门表面的温度,再慢慢打开一条门缝
C.架设消防梯登高灭火时,要避开喷火的窗口
D.扑救封舱灭火的门或盖时,消防人员要站在开启部位的一侧
[单选题]对于手车式开关柜,一般情况下,仅对手车开关本体进行检修时,应在( )状态下进行。
A.开关柜检修
B.开关检修
C.开关仓检修
D.出线仓检修
[填空题]电力机车齿轮传动装置的小齿轮表面淬火硬度为大于( )。
[填空题]选煤厂信息管理系统,包括()和()两大功能。
[单项选择]诊断早期糖尿病肾病最有意义的检查是()
A. 尿常规检查
B. 微量蛋白尿测定
C. Addis计数
D. 肌酐清除率
E. 双肾B超
[单项选择]女性,45岁,查体发现血压为160/90mmHg,平素无症状,确定有无高血压的最佳方法是()
A. 同时测3次血压
B. 测运动后血压
C. 进行动态血压检查
D. 不同时间测3次血压
E. 同时测上、下肢血压
[不定项选择题]共用题干
第一篇
How the First Stars in the Universe Came into Existence
Researchers believe that our universe began with the Big Bang(宇宙大爆炸)about 13 billion years
ago,and that soon after that event,matter began to form as small dust grains and gases.How the first stars
formed from this dust and gas has been a burning question for years,but a state-of-the-art computer simula-
tion now offers the most detailed picture yet of how these first stars in the universe came into existence.
The composition of the early universe was quite different from that of today,and the physics that
governed the early universe were also somewhat simpler. Dr. Naoki Yoshida and colleagues in Japan and the
U.S.incorporated these conditions of the early universe,sometimes referred to as the"cosmic dark ages",to
simulate the formation of an astronomical object that would eventually shine its light into this darkness.
The result is a detailed description of the formation of a protostar(原恒星)一the early stage of a mas-
sive primordial(原始的)star of our universe , and the researchers ' computer simulation , which has been
called a"cosmic Rosetta Stone"sets the bar for further investigation into the star formation process.The ques-
tion of how the first stars evolved is so important because their formations and eventual explosions provided
the seeds for subsequent stars to come into being.
According to their simulation,gravity acted on minute density variations in matter,gases,and the myste-
riou;"dark matter"of the universe after the Big Bang in order to form this early stage of a star一a protostar
with a mass of just one percent of our sun. The simulation reveals how pre-stellar(前恒星的)gases would
have actually evolved under the simpler physics of the early universe to form this protostar.
Dr. Yoshida's simulation also shows that the protostar would likely evolve into a massive star capable of
synthesizing(合成)heavy elements,not just in later generations of stars,but soon after the Big Bang.
"This general picture of star formation,and the ability to compare how stellar objects form in different
time periods and regions of the universe,will eventually allow investigation into the origins of life and
planets,"said Lars Herriquist,a professor of Astronomy at Harvard University and a co-author of this latest
report."The abundance of elements in the universe has increased as stars have accumulated,"he says,"and
the formation and destruction of stars continues to spread these elements further across the universe.So all of
the elements in our bOdies originally formed from nuclear reactions in the centers of stars,long ago."
Their simulation of the birth of a protostar in the early universe signifies a key step toward the ambitious
goal of piecing together the formation of an entire primordial star and of predicting the mass and properties of
these first stars of the universe.More powerful computers,more physical data,and an even larger range will
be needed for further calculations and simulations,but these researchers hope to eventually extend this simu-
lation to the point of nuclear reaction initiation一when a stellar object becomes a true star.
"Dr. Yoshida has taken the study of primordial star formation to a new level with this simulation,but it
still gets us only to the halfway point towards our final goal.It is like laying the foundation of a skyscraper,"
said Volker Bromm,assistant professor of Astronomy at the University of Texas, Austin and the author of a
companion article."We must continue our studies in this area to understand how the initially tiny protostar
grows,layer by layer,to eventually form a massive star. But here,the physics become much more complicated
and even more computational resources are needed."
What does the"an astronomical object"in Paragraph 2 refer to?
A.Cosmic dark ages.
B.Dust grains and gases.
C.A protostar.
D.The early universe.
[单选题]某公司花费几年时间研发出来一个新的绩效考评方法,最后在使用前的论证会上被公司否定。对此,从确定具体的绩效考评方法的角度考虑,你认为问题出在()
A.领导思想太守旧,不接受新事物
B.公司可能有了其他绩效考评方法
C.该绩效考评方法可能不具有工作实用性
D.可能该考评的指标体系不够完整
[判断题]OSPF 特点之一是只支持 MD5 验证
A.正确
B.错误
[单选题]国家综合性消防救援队伍各级机关、组织集体作 出的决定违法违纪或者实施违法违纪行为的,对负有责任的领导人员和直接责任人员给予()。
A.处分
B.略
C.略
D.略
E.略
F.略
[单项选择]对慢性粒细胞性白血病描述错误的是
A. 白细胞数显著升高,以中性中幼粒以下阶段细胞为主,并有嗜酸性粒细胞和嗜碱性粒细胞增多
B. Ph染色体是本病的特征性异常染色体,所有慢粒患者均可检出该染色体
C. 外周血嗜碱性粒细胞>20%,提示为加速期
D. 属于多能干细胞水平突变的克隆性疾病
E. NAP积分明显减低甚至为0
[多项选择]外睑腺炎是下列哪些腺体的化脓性炎症( )
A. 睑板腺
B. Meibom腺
C. Zeis腺
D. Moll腺
E. 以上均是
[判断题]工作期间,工作票应始终保留在工作票签发人手中。
A.正确
B.错误
[判断题]在盲板抽堵作业点流程的上下游应有阀门等有效隔断。
A.正确
B.错误
[多项选择]农机监理机构办理拖拉机登记业务使用的印章包括()
A. 证件专用章
B. 业务专用章
C. 检验业务专用章
D. 个人专用名章
[填空题]______是最低级的能够建立条件反射的动物。
[单项选择]患者,女性,31岁,宫内妊娠30周,头晕、胸闷、憋气入院,血压190/120mmHg,心率116次/分,听诊双侧肺底有明显的水泡音;PT12s,PLT120×10/L。患者否认既往高血压、心脏病史。拟行剖宫产终止妊娠。患者经过治疗后血压150/95mmHg,心率90次/分,听诊双肺底有湿啰音,选择什么麻醉最合适()。
A. 局麻辅助镇痛镇静
B. 腰麻
C. 硬膜外麻醉
D. 全身麻醉
E. 腰麻-硬膜外联合麻醉
[单选题]路由器访问控制列表提供了对路由器端口的一种基本安全访问技术,也可以认为是一种内部( )。
A.防火墙技术
B.入侵检测技术
C.加密技术
D.备份技术