热门试题:
[单项选择]下列叙述中正确的是()。
A. 数据库系统是一个独立的系统,不需要操作系统的支持
B. 数据库设计是指设计数据库管理系统
C. 数据库技术的根本目标是要解决数据共享的问题
D. 数据库系统中,数据的物理结构必须与逻辑结构一致
[单选题]启动直流电动机时,通常在电枢回路中串入一定的电阻,目的是( )
A.防止产生过大的反电势
B.限制启动电流
C.防止飞车
D.产生电磁转矩
[判断题]盘式制动器安装好以后,要用力的踩制动踏板到底,连踩数次;这样做的目的是为了让制动管路充满制动液
A.正确
B.错误
[判断题](类别:号段管理难度:中等)物联网设备安全监测平台面向使用联通物联网卡的行业客户提供服务()
A.正确
B.错误
[单选题]402.带负荷更换跌落式熔断器作业,短接故障线路或设备前,应确认( )已隔离。
A.故障
B.设备
C.开关
D.跌落式熔断器
[判断题]由于K2Cr2O7容易提纯,干燥后可作为基准物直接配制标准液,不必标定。
A.正确
B.错误
[多选题]在Excel电子表格中,可以进行计算的是( )
A.数值
B.文本
C.分式
D.日期
[多选题]工厂常见的着火源有 ( )。
A.明火
B.化学反应热
C.热辐射
D.高温表面
E.摩擦和撞击
[单项选择]女性,55岁,四年来逐渐出现上腹胀满,食欲减退,伴舌炎及巨幼红细胞贫血,胃镜见胃粘膜,红白相间以白为主,该患诊断首先考虑
A. 慢性浅表性胃炎
B. 早期胃癌
C. 慢性肥厚性胃炎
D. 急性胃粘膜病变
E. 慢性萎缩性胃炎
[判断题]生产经营单位主要负责人对本单位事故隐患排查治理工作全面负责。( )
A.正确
B.错误
[判断题]机械加工厂房发生火灾,内攻人员应做好防静电措施。( )
A.正确
B.错误
[单项选择]美育作为感性教育、趣味教育和人格教育()
A. 只发展人的感性
B. 只发展人的情感
C. 只发展人的理性
D. 既发展人的感性,又发展人的理性
[判断题]升降式止回阀,升降的阀瓣的轴心一定要呈垂直方向。( )
[单项选择]既能固精又能补肾助阳的药物是()
A. 牡蛎
B. 桑螵蛸
C. 巴戟天
D. 海螵蛸
E. 金樱子
[单项选择]网格分析比较常用的功能有( )。
①计算公共设施的供需负荷,②坡度、坡向、日照强度的分析,③地形的任意断面图生成;④可视性检验;⑤工程填挖方计算;⑥根据点状样本产生距离图、密度图
A. ①②③④⑤
B. ②③④⑤⑥
C. ①③④⑤⑥
D. ①②④⑤⑥
[单项选择]示宽灯一侧不亮,更换灯泡后仍不亮,如果正极是好的则应检查()。
A. 灯泡好坏
B. 电流
C. 电阻
D. 搭铁线
[单选题] 吊点位置的选择必须遵循的原则有:( )。
A. 吊点在重心的一侧
B.吊点与中心在同一铅垂线上
C.重心在两吊点之间
D.吊点在重心的下方
[多选题]在发现危及电力通信系统安全的紧急情况时,有权停止作业,()。
A.A-采取紧急措施
B.B-采取安全措施
C.C-并立即报告
D.D-并立即撤离
[单选题]假设商业银行持有资产组合
A,根据投资组合理论,下列哪种操作降低该组合风险的效果最差 ( )
A.卖出50%资产组合
A,用于购买与资产组合A的相关系数为0的资产组合Y
B.卖出50%资产组合
A,用于购买与资产组合A的相关系数为-0.5的资产组合Z
A.卖出50%资产组合
B.持有现金
C.卖出50%资产组合
D.用于购买与资产组合A的相关系数为+0.8的资产组合X
[单选题]关于雾视的说法正确的是( )。
A.雾视前投0.1视标
B.雾视量为0.3视标不能识别
C.雾视时间为3~5min
D.近视眼雾视时逐渐加负镜片
[不定项选择题]共用题干
Transport and Trade
1.Transport is one of the aids to trade.By moving goods from places where they are plentiful to places where they are scarce,transport adds to their value.The more easily goods can be brought over the distance that separates producer and consumer,the better for trade.When there were no railways,no good roads,no canals,and only small sailing ships,trade was on a small scale.
2.The great advances made in transport during the last two hundred years were accompanied by a big increase in trade.Bigger and faster ships enabled a trade in meat to develop between Britain and New Zealand,for instance.Quicker transport makes possible mass-production and big business, drawing supplies from,and selling goods to,all parts of the globe.Big factories could not exist with-out transport to carry the large number of workers they need to and from their homes.Big city stores could not have developed unless customers could travel easily from the suburbs and goods delivered to their homes.Big cities could not survive unless food could be brought from a distance.
3.Transport also prevents waste.Much of the fish landed at the ports would be wasted if it could not be taken quickly to inland towns.Transport has given us a much greater variety of foods and goods since we no longer have to live on what is produced locally.Foods which at one time could be obtained only during a part of the year can now, be obtained all through the year. Transport has raised the standard of living.
4.By moving fuel,raw materials,and even power,as,for example,through electric cables, transport has led to the establishment of industries and trade in areas where they would have been impossible before.Districts and countries can concentrate on making things which they can do better and more cheaply than others and can then exchange them with one another. The cheaper and quicker transport becomes,the longer the distance over which goods can profitably be carried.Countries with poor transport have a lower standard of living.
5.Commerce requires not only the moving of goods and people but also the carrying of messages and information. Means of communication,like telephones,cables and radio,send information about prices,supplies,and changing conditions in different parts of the world.In this way,advanced communication systems also help to develop trade.
Paragraph 2_______
A.Higher living standard.
B.Importance of transport in trade.
C.Various means of transport.
D.Birth of transport-related industries and trade.
E.Role of information in trade.
F.Public transportation.
[多选题]根据《119接警调度工作规程》(GA/T1339-2017),下列关于警情要素的说法正确的是()。
A.警情要素包括地点、类别和灾情
B.地点包括行政区域名称,路名、门牌号码,单位名称或参照物,经纬度坐标等
C.类别分为火警和应急救援
D.类别分为火警、应急救援和社会救助
E.灾情包括遇险人员的数量、伤亡情况、危害程度以及其他现场灾情等
[填空题]胀轨跑道,在理论上称为( ),它将严重危及行车安全。
[单选题]水枪后应留有( )米左右的机动水带,水枪手位于两侧站立,身高( )的在前,以便战斗员及时发现异常、快速移动位置躲避风险。水枪手后方不得站人或拥挤,便于快速撤离。
A.5、矮
B.5、高
C.10、矮
D.10、高
[判断题]搅拌机料斗提升时,运料人员可在料斗下停留或通过
A.正确
B.错误
[单项选择]“江流天地外,山色有无中”是()的诗句
A. 李白
B. 高适
C. 张九龄
D. 王维
[单选题]( )有权对建设项目的安全设施与主体工程同时设计、同时施工、同时投入生产和使用进行监督,提出意见。
A. 工会
B. 公司董事会
C. 为本企业服务的保险公司
D. 公司党委会
[单选题]在同种不同个体组织和细胞中存在的不同抗原被认为是( )
A. 同种异型抗原
B. 异种抗原
C. 异嗜性抗原
D. 相容性抗原
E. 共同抗原
[判断题]长期未解付银行本票、银行汇票的资金,按照《票据法》规定,超过二年票据责任期的资金可以视同睡眠户处理,但要做好手工登记工作。( )
A.正确
B.错误
[单选题] 当遇到高压电线断落时,周围( )内禁止人员进入,如果已经进入,要单足或并足跳离危险区。
A..20米
B..30米
C..40米
D..50米
[单项选择]下列属于心的生理功能的是( )
A. 主藏血
B. 主血脉
C. 主治节
D. 主朝百脉
E. 主统血
[判断题]透视图中同一物体,其立点不同时,其显示的形状也会随之改变。
A.正确
B.错误
[单选题]为卷取机提供后张力的是( )。
A.5#夹送辊
B.张紧辊
C.4#夹送辊
D.转向夹送辊