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[单选题]组装式直流高压发生器,保护电阻可按R=(____)Ud/Id选取。
A.0.001~0.01
B.0.01~0.1
C.0.003~0.02
D.0.03~0.05

热门试题:

[单项选择]配电线路导线弧垂、限距及交叉跨越距离测量()进行。
A. 五年
B. 根据巡视结果
C. 三年
[不定项选择题]某家信用评级为AAA级的商业银行目前发行3年期有担保债券的利率为4.26%。现该银行要发行一款保本型结构化产品,其中嵌入了一个看涨期权的多头,产品的面值为100。而目前3年期的看涨期权的价值为产品面值的12.68%,银行在发行产品的过程中,将收取面值的0.75%作为发行费用,且产品按照面值发行。如果将产品的杠杆设定为120%,则产品的保本比例在(  )%左右。
A.80
B.83
C.90
D.95
[单项选择]除以下哪项以外均是脾病的常见症状
A. 腹胀腹痛
B. 恶心嗳气
C. 泄泻
D. 浮肿
E. 出血
[单项选择]下列图像格式中,可以将多幅图像保存为一个图像文件,从而形成动画的是()。
A. GIF
B. BMP
C. JPG
D. TIF
[多选题]《暂态地电压局部放电检测细则》中规定,暂态地电压局部放电检测仪器,宜具备状态评价功能。提供局部放电信号的( )等信息中的一种或几种,并可采用波形图、趋势图等谱图中的一种或几种进行展示。
A.幅值
B.相位
C.频率
D.放电频次
[单项选择]I still remember I fell in love with (Example: (0) ) from a very young age, because I thought it was such, a (n) (41) language. Full of strong wishes of learning English, I began to (42) it. But soon I found it (43) than expected. There were too many words, expressions and many other things to remember. And even if you know (44) , you can’t use them correctly and exactly. And I did rather (45) in my first English test. I was worried about it. This made me upset and I dropped my interest in English (46) .
While I was in trouble, my English teacher gave me much help. I knew that interest didn’t mean (47) and I should have some learning methods. I did as he said and tried many different ways of learning English. (48) the days went by, I could do better and better and became more and more interested in it.
During summer vacation, an old lady from Australia visited my school. She
A. When
B. As
C. While
[单选题] 不能直接验电的母线合接地开关前,必须核实连接在该母线上的全部( )已拉开且锁闭,检查连接在该母线上的电压互感器的二次空气开关(熔断器)已全部断开。
A. 开关
B. 隔离开关
C. 熔断器
D. 负荷开关
[单选题]在Word编辑状态下,删除光标前的字符,可以按( )
A.Backspace
B.Del
C.Ctrl+P
D.Shift+A
[单选题]下列选项中,不属于商业银行产品开发方法的是( )。
A.仿效法
B.交叉组合法
C.低成本法
D.创新法
[单选题]千分尺测量精度为( )毫米
A.0.01
B.0.02
C.0.5
D.0.1
[判断题]协作地公安机关抓获犯罪嫌疑人后,应当立即通知办案地公安机关。办案地公安机关不能及时到达协作地的,应当委托协作地公安机关在拘留、逮捕后二十四小时以内进行讯问。)
A.正确
B.错误
[多项选择]酸洗入口上卷时应注意核对哪些信息()
A. 热轧号
B. 冷轧号
C. 规格
D. 材质
[单选题]工作在湿蒸汽区的汽轮机的级,受水珠冲刷腐蚀最严重的部位是( )。
A. 动叶顶部背弧处;
B. 动叶顶部内弧处;
C. 动叶根部背弧处;
D. 喷嘴背弧处。
[单项选择]对失压母线试送电时,应尽量使用()进行充电,且()必须具备快速灵敏切除充电母线故障的保护。
A. 变压器
B. 母联开关
C. 外部电源
D. 内部电源
[单选题]HXD1C型电力机车正常情况下,( )不属于第2辅助变流器供电范围。
A.牵引电动机风机
B.空气压缩机
C.油泵
[多选题]在电气设备上工作,保证安全的技术措施由(  )执行。
A. 调控人员
B. 检修人员
C. 运维人员
D. 有权执行操作的人员
[单选题]发生火灾时,对的安全疏散主要有三个方向,向下可以跑到地面,向上可以爬到屋顶,还可以( )
A.躲到角落里
B. 向外逃到阳台
C.钻到阁楼、大橱等处避难
[简答题]场效应管也是一种()三极管
[多选题]E课程|收益管理系统|:收益管理系统(RMS)中RP-F的计算公式是什么?
A.OCC-F大于100%,公式:OCC-F*ADR-F
B.OCC-F小于等于100%,公式:OCC-F*ADR-F
C.OCC-F小于100%,公式:100%*ADR-F
D.OCC-F大于100%,公式:100%*ADR-F
[单项选择]天津市空中交通管理分局()《民用航空空中交通管理运行单位安全管理规则》中所指的民航空管运行单位。
A. 属于
B. 不属于
C. 部分属于
D. 部分不属于
[单项选择]克雷伯杆菌肺炎的X线胸片表现出现叶间隙下坠,其原因是()
A. 细菌在细胞内生长繁殖,引起组织坏死、液化形成 
B. 病变中的炎性渗出液黏稠而重 
C. 肺泡内的渗出液由Cohn孔向周围肺泡蔓延所致 
D. 肺泡内的纤维蛋白渗出较多 
E. 肺泡内的渗出含有较多的红白细胞
[判断题]局主要是制定基层建设年度计划和措施,解决重大问题,搞好重点指导。
A.正确
B.错误
[判断题]使用手持电动工具应满足:在一般作业场所若使用I类工具时,应装设额定漏电动作电流不大于30mA、动作时间不大于0.2s的漏电保护器
A.正确
B.错误
[单选题]在制订一次体育课教学目标时,除学生情况和教学条件外,还应重点考虑( )。
A.领导评价
B.同行评价
C.单元评价
D.教学环境
[单选题]多股软铜引线与扁铜线焊接时,应先将多股软引线端头用细铜线绑扎并打扁,在导线上搭接的长度应为导线宽度的( )倍。
A.0.5
B.1.5~2.5
C.3
D.5
[多选题]存储设备( )等工作前,应确认所承载业务可停运或已转移。工作结束前,应验证存储设备上承载的业务系统运行正常。
A.更换硬件
B.扩充容量
C.升级软件
D.变更参数
[不定项选择题]共用题干 “Liquefaction” Key to Much of Japanese Earthquake Damage
The massive subduction zone earthquake in Japan caused a significant level of soil“liquefaction” that has surprised researchers with its1severity,a new analysis shows.
“We've seen localized examples of soil liquefaction as extreme as this before,but the distance and2of damage in Japan were unusually severe,”said Scott Ashford,a professor of geotechnical engineering at Oregon State University.“Entire structures were tilted and sinking into the sediments,”Ashford said.“The shifts in soil destroyed water,drain and gas pipelines,crippling the utilities and infrastructure these communities need to3. We saw some places that sank as much as four feet.”
Some degree of soil liquefaction is common in almost any major earthquake. It's a phenomenon in which soils soaked with water,particularly recent sediments or sand,can lose much of their4and flow during an earthquake. This can allow structures to shift or sink or5.
But most earthquakes are much6than the recent event in Japan,Ashford said. The length of the Japanese earthquake,as much as five minutes,may force researchers to recon-sider the extent of liquefaction damage possibly occurring in situations such as this.
“With such a long-lasting earthquake,we saw7structures that might have been okay after 30 seconds just continued to sink and tilt as the shaking continued for several more minutes,”he said.“And it was clear that younger sediments,and especially areas built on8filled ground,are much more vulnerable.”
The data provided by analyzing the Japanese earthquake,researchers said,should make it possible to improve the understanding of this soil9and better prepare for it in the future.Ashford said it was critical for the team to collect the information quickly,10damage was removed in the recovery efforts.
“There's no doubt that we'll learn things from what happened in Japan that will help us to reduce risks in other similar11,”Ashford said.“Future construction in some places may make more use of techniques known to reduce liquefaction,such as better compaction to make soils dense,or use of reinforcing stone columns.”
Ashford pointed out that northern California have younger soils vulnerable to liquefac-tion一on the coast,near river deposits or in areas with filled ground. The“young”sedi-ments,in geologic terms,may be those12within the past 10,000 years or more. In Ore-gon,for instance,that describes much of downtown Portland,the Portland International Airport and other cities.
Anything13a river and old flood plains is a suspect,and the Oregon Department of Transportation has already concluded that 1,100 bridges in the state are at risk from an earthquake.
Fewer than 15 percent of them have been reinforced to14collapse. Japan has suffered tremendous losses in the March 11 earthquake,but Japanese construction15 helped prevent many buildings from collapse一even as they tilted and sank into the ground. 13._________
A.near
B.from
C.inside
D.over
[判断题] 济南轨道交通事业始终坚持以服务为中心的发展思想,以畅通济南,纾解交通压力为根本出发点。
A.正确
B.错误
[单项选择]患儿,男,2岁,体重9kg。入托体检时发现心脏杂音前来就诊,曾患肺炎3次,有喂养困难史,无昏厥、抽搐史。心电图检查显示左心室肥大,X线胸片显示心影轻度至中度增大,两侧肺血增多,肺动脉段突出,主动脉结缩小。心电图检查结果符合的诊断为()
A. 二尖瓣狭窄
B. 房间隔缺损
C. 室间隔缺损
D. 心肌炎
E. 动脉导管未闭
[单选题]有解痉作用的是:
A.奎宁
B.黄连素
C.莨菪碱
D.烟碱
E.乌头碱
[单项选择]()是两个摩擦表面之间没有润滑剂介入,面直接接触时产生的摩擦。
A. 干摩擦
B. 液体摩擦
C. 边界摩擦
D. 混合摩擦
[单选题]关于气割的应用领域,下列说法正确的是( )。
A.切割任何材料
B.钢板下料、焊接坡口和铸件浇冒口的切割
C.只能切割简单形状
[单项选择]交流电的平均值和最大值的关系是()。
A. 0.633
B. 0.635
C. 0.637
[单选题](0.25分)单选题
下列有关药物依赖性的叙述,错误的是
A.精神依赖性又称心理依赖性
B. 分为躯体依赖性和精神依赖性
C. 绝大多数具有依赖性的药物同时兼有精神依赖性和躯体依赖性
D. 躯体依赖性又称心理依赖性
E. 一旦产生躯体依赖性,中断用药将产生戒断症状
[判断题]为鼓励大型货车运输,对四轴及四轴以上货车,通行费下浮14%收取。
[判断题]《治安管理处罚法》规定,检查妇女的身体,应当由女性工作人 员进行。( )
A.正确
B.错误
[单选题]按《江苏石油分公司油库含油污水污染防治管理规定》中的要求,各地市公司应至少( )对油库污水处理情况进行一次检查。
A.每月
B.每季度
C.每半年
D.每年

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