热门试题:
[单项选择]
M: Come in, please. What can I do for you
W: Professor Donner, are you giving your Advanced Geology course next semester
M: Yes, I’m planning on it.
W: Could I be enrolled in it I know it’s a graduate course and I’m only a junior, but...
M: Aren’t you a bit young I’ve allowed qualified seniors to take the course and they usually have a hard time keeping up.
W: I know. But the geology of the American West is my favorite interest and I’ve done a lot of reading in the field. Last semester I took Professor Burman’s course and I didn’t find it really challenging enough.
M: I see. You certainly aren’t one of those students who are out for easy grades.
W: I should say not. I really want to learn something.
M: Well, I’ll speak to Professor Burman. If he thinks you’re ready, I’ll let you enroll.
W: Oh, thanks. That’s really very kind of you.
A. She is unusually well prepared.
B. She wants to take an easy course.
C. She needs additional credits in the subject.
D. She wants to read a book in this field.
[判断题]安全管理原理是现代企业安全科学管理的基础、战略和纲领。
A.正确
B.错误
[单项选择]“一丝不苟”中的“丝”的含义是( )。
A. 计量单位
B. 丝线
C. 丝绸
D. 发丝
[判断题]链条装在链轮上需要很大的张紧力,对轴的压力大。( )
A.正确
B.错误
[单选题]（）是商品供给信息、价格信息、流通渠道信息以及商品需求信息的总和。
A.商品技术信息
B.商品供求信息
C.商品消费信息
D.商品属性信息
[判断题]555.（ ）直线杆改耐张杆并加装柱上开关时，在开断导线前应有防止导线弹跳的措施。
A.正确
B.错误
[单选题]19:单机在自动闭塞区间被迫停在调谐区内,当具备移动条件时司机须先将机车移动不少于( )m。(1.00分)
A.10
B.15
C.20
[判断题](1.00分)原合同工期履约项目占比率：当年按原合同工期已竣工项目数量 与当年按原合同工期应竣工项目数量的比值。
A.正确
B.错误
[单项选择]《素问·调经论》“阳虚则外寒”指的是（）
A. 临床上的内阳虚外寒束
B. 现在临床上的表证恶寒
C. 临床辨证中的阳虚畏寒
D. 阴阳失调的阳盛格阴
E. 阴阳气逆的阳虚肢厥
[单选题]下列各句中加点成语使用恰当的一项是( )。
A.本来藏在叶子底下的那盏路灯格外明亮,马路豁然开朗,像拓宽了几尺。
B.为了大桥的早日建成通车,工程技术人员处心积虑地克服了许多困难。
C.自私者只记得“为己”二字,在他们看来,舍己救人,公而忘私的行为是不可思议的。
D.银杏树根深蒂固,抗风力很强,是扩大绿化面积,治理山河的优良树种。
[单项选择]从氢回收装置的操作温度看，应当属于（）操作。
A. 常温
B. 低温
C. 深冷
D. 高温
[判断题]在燃气检查室内作业的人员发现随身携带的检测报警仪电量低，应与监护人员沟通后，出离井室更换电池。
A.正确
B.错误
[单选题]热继电器在电路中的作用是( )。
A.短路保护
B.过载保护
C.欠压保护
D.失压保护
[单选题]下列属于资本市场金融工具的是()
A.商业票据
B.股票
C.银行承兑汇票
D.回购协议
[单选题]唇裂术后，最主要的护理是( )
A.保持口腔清洁
B.每日清洁创口
C.按时用药
D.避免搔抓创口
[判断题]更换焊条时,可以不戴绝缘手套,对于空载电压和工作电压较高的焊接操作,应该在工作台附近地面上铺上绝缘胶皮或其他绝缘材料。
A.正确
B.错误
[多选题]22、下列关于不得担任人民警察的说法对的是（）。
A.A.甲曾被判处有期徒刑，不得担任人民警察
B.B.乙曾被强制隔离戒毒，不得担任人民警察
C.C.丙曾被工商局开除公职，不得担任人民警察
D.D.丁曾被某县公安局辞退，不得再担任人民警察
[单项选择]下面哪一次教育体制改革，认为课程改革是教育改革的核心问题( )
A. 1985年《中共中央关于教育体制改革的决定》
B. 1993年《中国教育改革和发展纲要》
C. 1999年《中共中央、国务院关于深化教育改革，全面推进素质教育的决定》
D. 2001年《国务院关于基础教育改革与发展的决定》
[判断题]在原工作票的停电及安全措施范围内增加工作任务时，应由工作负责人征得工作许可人同意，并在工作票上增填工作项目。
A.正确
B.错误
[单项选择]患者，男性，30岁，2年前发现右腹股沟肿块，约3cm×3cm大小，站立或咳嗽时出现，平卧后消失。2年来肿块逐渐增大到10cm×5cm大小。肿块突出时感下腹坠胀、隐痛。查肿块坠入阴囊，回纳后压迫内环，不再出现。问：根据病史，该患者可能的诊断是什么（）
A. 右腹股沟斜疝
B. 右腹股沟直疝
C. 右股疝
D. 切口疝
E. 白线疝
[单项选择]
A. hands
B. brains
C. organs
D. legs
[单选题]听觉信号重复鸣示时，须间隔（ ）秒以上。
A.一
B.二
C.三
D.五
[单项选择]对健康信息的描述正确的是（）
A. 健康信息不属于卫生资源
B. 指有关人的健康的知识
C. 指有关人的健康的技术
D. 指有关人的健康的行为模式
E. 泛指一切有关人的健康的知识、概念、技术、技能和行为模式
[单选题]V带传动是以（ ）为工作面。
A.内表面
B.外表面
C.两侧面
D.端面
[单项选择]病人月经周期提前，月经量多，色深红质稠，经期淋漓不净，经行发热；面红口干，大便干结，小便短赤；舌红，苔薄黄，脉滑数。证属（）
A. 肝郁化热
B. 实热
C. 瘀热
D. 虚热
E. 湿热
[判断题]用汽车运输气瓶，气瓶可以顺车厢纵向放置。
A.正确
B.错误
[单选题]目前广泛采用的氯气冷却器是( )。
A.石墨冷却器
B.玻璃冷却器
C.钛管冷却器
D.碳钢冷却器
[多选题]产品设计的基本要求是( )。
A.审美性要求
B.经济性要求
C.适应性要求
D.功能性要求
E.创造性要求
[判断题]溢流量，对于压井过程中套管压力的大小不起作用。
A.正确
B.错误
[单选题]区间内正线道岔的定位为( )的位置。
A.正线开通
B.开通岔线
C.开通安全线
D.开通到发线
[单项选择]尺寸数字一般注写在尺寸线的（）
A. 上方
B. 下方
C. 左侧
D. 右侧
[多选题]环网柜应在（）后，方可打开柜门。
A. 停电
B. 验电
C. 合上接地刀闸
D.悬挂“止步，高压危险！”标示牌
[单选题]车多头螺纹时应按( )来计算挂轮。
A.螺距
B.导程
C.头数
[填空题]GPS
A The Global Positioning System is a space-based triangulation system using satellites and computers to measure positions anywhere on earth. It is first and foremost a defense system developed by the United States Department of Defense, and is referred to as the "Navigation Satellite Timing and Ranging Global Positioning System" or NAVSTAR GPS. The uniqueness of this navigational system is that it avoids the limitations of other land-based systems such as limited geographic coverage, lack of continuous 24-hour coverage, and the limited accuracies of other related navigational instruments. The high accuracies obtainable with the Global Positioning System also make it a precision survey instrument. GPS Components: the Space Segment, the Control Segment, and the User Segment.
B The Space Segment of the system consists of the GPS satellites. These space vehicles (SVs) send radio signals from space. The GPS Operational Constellation consists of 24 satellites that orbit the earth in 12 hours. There are often more than 24 operational satellites as new ones are launched to replace older satellites. The satellite orbits repeat almost the same ground track (as the earth turns beneath them) once each day. The orbit altitude is such that the satellites repeat the same track and area over any point approximately each 24 hours (4 minutes earlier each day). There are six orbital planes (with four SVs in each), equally spaced (60 degrees apart), and inclined at about fifty-five degrees with respect to the
equatorial
(赤道的) plane. This constellation provides the user with between five and eight SVs visible from any point on the earth.
C The Control Segment consists of a system of tracking stations located around the world. The Master Control facility is located at Schriever Air Force Base (formerly Falcon AFB) in Colorado. These monitor stations measure signals from the SVs which are incorporated into orbital models for each satellites. The models compute precise orbital data and SV clock corrections for each satellite. The Master Control station uploads orbital data and clock data to the SVs. The SVs then send subsets of the orbital
ephemeris
(星历表) data to GPS receivers over radio signals.
D The GPS User Segment consists of the GPS receivers and the user community. GPS receivers change SV signals into position, speed, and time estimates. Four satellites are required to compute the four dimensions of X, Y, Z (position) and Time. GPS receivers are used for navigation, positioning, time distribution, and other research. Navigation in three dimensions is the primary function of GPS. Navigation receivers are made for aircraft, ships, ground vehicles, and for hand carrying by individuals. Precise positioning is possible using GPS receivers at reference locations providing corrections and relative positioning data for remote receivers. Surveying, geodetic control, and plate tectonic studies are examples.
E Time and frequency distribution, based on the precise clocks on board the SVs and controlled by the monitor stations, is another use for GPS. Astronomical observatories, telecommunications facilities, and laboratory standards can be set to precise time signals or controlled to accurate frequencies by special purpose GPS receivers. Research projects have used GPS signals to measure atmospheric parameters.
F At present the system consists of 24 satellites at an altitude of about 20,000 km having an orbital inclination of 55 degrees. The orbits are almost circular and it takes 12 hours for a satellite to complete a pass around the Earth. GPS signals are broadcast from a cluster of 24 or more earth orbiting satellites. Because the GPS signals are derived from the atomic frequency standards on board each satellite, they are widely used as a reference for time synchronization and frequency adjustment. The real time positioning accuracy of a single receiver is normally up to 100 meters horizontally and 150 meters vertically. However, various methods have been developed which enable much higher accuracy (centimeter level).
G There are a variety of different types of GPS receivers on the market for commercial and public use. Prices range from $500 to $30,000, reflecting the accuracy and capabilities of the instruments. For the general outdoorsman, a good GPS receiver should have 8 satellite tracking capability and be capable of receiving the GPS satellite signals through forest covering in northern Ontario shield area; for the professional user, a minimum 8 satellite tracking capability, high memory capacity, differential GPS capability, and resistance to signal weakening under forest covering is essential; for the professional surveyor requiring high level precision and accuracy capability, they should assess the project or application for which the technology is to be used with the help of an unbiased consultant, in order to determine the most cost effective and appropriate instrument.
H Small hand held navigational units at relatively low cost allow boaters and hikers to know their position within a few hundred meters. This accuracy is sufficient for recreational use. A hand held or similar mapping unit at mid-range price that is linked to a fixed broadcast base station. These units allow utility companies, municipalities and others to locate various items (telephone poles, waterlines, valves) with a positional tolerance of several meters. This is suitable for some Geographical Information Systems (GIS) mapping purposes.
I GPS technology offers numerous benefits to law enforcement agencies of all types. For some agencies, the navigational capabilities offered by GPS enhance efficiency and safety. These navigational applications can be used to support a variety of policing and criminal justice functions. Other agencies use GPS positioning technologies to carry out special operations or to provide enhanced personnel safety. For example, using computerized maps of their rights given by law, cooperated with GPS, aviation personnel can determine location, speed and time.
J The positioning capabilities offered by GPS may also contribute to the success of specialized law enforcement operations such as in controlling vehicles. One such program operated in Minneapolis led to a 60% reduction in auto theft after only one month. The automatic vehicle location systems can not only provide efficiency of response and help ensure officer safety, but also provide officer with accurate information concerning the best response route to an incident. What"s more, they can provide officers information that allows the closest patrol officers to be dispatched to a particular incident.
K Advanced Transportation Management Systems (ATMS) are heavily dependant upon GPS technology to provide data about the road system. GPS allows for law enforcement personnel to clear roadway blockages to ensure the safety of motorist. Most people associate law enforcement with the prevention, reduction, and prosecution of criminal activity. In fact, a large portion of local law enforcement resources are involved in facilitating the movement of people and vehicles in a safe manner. In conclusion, large-volume commercial applications such as cellular phones, personal communication systems, and in-vehicle navigation systems will fuel continued development of these technologies. What was ultimately the domain of the Department of Defense is rapidly becoming available for business, private, and general government use. Policing and public safety in general, will benefit from these market forces. It is clear that there are a number of GPS applications for policing.The prices of various GPS receivers are determined by their accuracy and capabilities.
