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[单选题]对焊条电弧焊电源的基本要求不包括那项( )
A.电源外特性
B.成本
C.空载电压
D.电源调节特性

热门试题:

[多选题]应收账款函证回函确认的金额与函证的金额有差异,可能存在的原因有:
A.购销双方登记入账的时间不同
B.一方或双方记账错误
C.被审计单位弄虚作假
D.函证方式不恰当
E.购销双方存在争议
[单项选择]( )常用来检查内部结构的裂纹、搭接、夹杂物、焊接不良的焊缝、锻造裂纹、腐蚀坑以及加工不适当的塑料压层等,还可以检查管道中流体的流量、流速以及泄露等。
A. 铁谱分析
B. 红外线监测
C. 光谱分析
D. 超声波探伤
[多项选择]客户的路由器MSR-1、MSR-2通过各自的GigabitEthernet0/0互连,同时两台路由器之间运行了RIP。 RIP已经正确完成了远端路由学习。在MSR-1上添加了如下配置: firewall enable acl number 3000 rule 0 deny udp destination-port eq 520 rule 5 permit ip 并将此ACL应用在MSR-1接口GigabitEthernet0/0的inbound方向上。那么()
A. MSR-1上仍然拥有到对端的RIP 路由
B. MSR-1上不能学习到对端的RIP 路由
C. MSR-2上仍然拥有到对端的RIP 路由
D. MSR-2上不能学习到对端的RIP 路由
[单项选择]()提出了“科学知识最有价值”的著名观点。
A. 卢梭
B. 斯宾塞
C. 裴斯泰洛齐
D. 赫尔巴特
[多选题]
2015年中国人民银行发行的航天纪念钞采取了( )防伪技术。
A. 水印
B. 动感光变开窗安全线
C. 对印技术
D. 雕刻凹印
[判断题]流动资金贷款期限是指从最后一笔贷款发放之日起至借款人按合同约定还清全部贷款本息之日止的时间。
A.正确
B.错误
[多选题]安全生产应当坚持( )的方针,从源头上防范化解重大安全风险。
A.安全第一
B.预防为主
C.综合治理
[填空题]

[听力原文]11-15
Many people who live in cities say that they dislike city life. They saw the city that they live in is noisy, dirty and crowded. They are tired of the traffic, the pollution in the air and the rubbish in the streets.
But not many people living in cities are happy when they have to stay in the country for two or three weeks. They en joy the quiet, the clean air and the beautiful healthy surroundings, but they miss the stores and restaurants, the movie theater, the crowds, and the excitement of the city. People who live in the country on the other hand enjoy visiting the city for a day or an evening to do some shopping or go to the theater or a concert. But they often find the city a rather frightening place and they are usually happy to get back to their quiet, unexciting lives, in the country.

What are the country people tired of
The country people are tired of()
[单项选择]已知[X]补=10111010,求X(真值)()?
A. -1000110
B. -1000101
C. 1000100
D. 100011
[单项选择]查询选修了课程号为C2的学生号和姓名,用下列SQL的SELECT语句表达时,哪一个是错误的( )
A. SELECT S.S#,SNAME FROM S WHERE S.S#
B. SELECT S.S#,SNAME FROMS,SC
C. S# AND C#=‘C2’C) SELECT S. S#,SNAME FROM S,SC
D. SELECT S.S#,SNAME FROM S
[判断题]使用吊车立、撤杆塔,钢丝绳套应挂在电杆的重心位置以防止电杆突然倾倒。( )
A.正确
B.错误
[单选题]华为NFV解决方案中,提供VNFM功能的软件是什么?
A.FusionSphere
B.FusionManager
C.FusionStorage
D.CloudOperaCSM
[单项选择]新安全阀在安装(),应根据使用情况进行调试,然后才准安装使用。
A. 前
B. 后
C. 前或后
D. 前和后
[单选题]砂浆输送泵的液压系统中,安全溢流阀的调整压力不得大于系统规定工作压力的()。
A.90%
B.100%
C.105%
D.110%
[多选题]下列对音频生命探测仪表述正确的是( )(中)
A.用于探测和搜寻因地震、坍塌、建筑物倒塌等被掩埋在废墟下的幸存者
B.长时间不用每周应开机一次,每次工作至少10min
C.能识别来自幸存者的声音如呼喊、拍打、刻划或敲击
D.可以将非目标的噪声波和其他背景干扰过滤,进而确定被困者的位置
[单项选择]中医学对肩周炎的认识不确切的是:()。
A. 气血亏虚,筋失濡养
B. 风寒湿邪,筋脉涩滞
C. 气血凝滞,筋肉挛缩
D. 肝肾虚弱,筋骨痹阻
E. 痰湿交结,关节不利
[填空题]国家建立( )制度,对食源性疾病、食品污染以及食品中的有害因素进行监测。
[多选题].符合下列哪些条件应进行锚固件破坏性检验?( )
A.安全等级为一级的后锚固构件。
B.悬挑结构
C.对后锚固设计参数有疑问。
D.对该工程的锚固质量有怀疑。
[单项选择]室性早搏宽大畸形的QRS波群前为()
A. 无相关的P波或提早出现的P波
B. 无窦性P波
C. 有逆行性的P波
D. 有窦性P波
E. 有提早出现的P波
[判断题]压力表垂直安装在泵的入口端。
[判断题]处理心绞痛的旅客,应注意观察其生命体征。
A.正确
B.错误
[单选题]旅客运输计划是确定客运设备、客运机车车辆修造计划及客运运营支出计划的()。
A.重要依据
B.重要前提
C.根本保证
D.基础
[多选题]以下属于劳动者职业病防护措施的是( )。
A.熟知职业病危害,严格遵守操作规程
B.正确使用个人防护用品
C.养成良好卫生习惯
D.接受职业健康检查
[单选题]根据《工程建设项目勘察设计招标投标办法》(八部委2号令),勘察设计招标中,投标人下列( )不属于弄虚作假,骗取中标。
A. 以他人名义投标
B. 利用伪造、转让、租借、无效的资质证书参加投标
C. 请其他单位在自己编制的投标文件上代为签字盖章
D. 未缴纳投标保证金
[填空题]一对齿轮传动中。两轮的转速比与它们的 ( )成反比
[单选题]A企业有资金,B企业经营活动需要资金,银行接受A企业的委托,把资金贷给B企业,这属于( )贷款。
A.自营贷款
B.委托贷款
C.信托贷款
D.违规贷款
[多选题]线路大、中修后,无垫层的碎石道床,应满足()。(A 、3、A) [020101]
A.枕下清碴厚度不得小于300mm
B.特殊困难条件下道床厚度不足300mm时,应清筛至路基面
C.做好排水坡
D.枕下清碴厚度不得小于200mm
[单选题]D08-32型捣固车外油缸(圆缸)的液压回路的压力是()MPa。
A.15
B.14
C.12
D.10
[判断题]在电缆牌和安装接线图上,只要注明电缆编号即可。()
A.正确
B.错误
[单项选择]

Passage One
What is color Why do some objects look red, others green, others blue
Color is caused by reflected light rays. We see color because objects reflect light. Some thing that is red reflects mostly red light. In the same way, a green object reflects mostly green light. White objects reflect all colors of light. Black objects do not reflect any light.
What happens to the colors of light that are not reflected They are absorbed by the object. The darker the color, the less light is reflected and the more light is absorbed. Light that is absorbed is turned into heat. For this reason, dark-colored clothes are warmer in the sunlight than light-colored clothes.

In the sunlight, the coolest clothes would be ()
A. yellow
B. black
C. green
D. white
[单选题]二线班人员接到呼叫后,应在 分钟内到岗( )
A.5
B.10
C.15
D.20
E.30
[单选题]居民家庭住宅、居民住宅小区、执行居民电价的非居民客户中设置的电动车充电设施用电,执行居民用电价 格中的合表客户电价。
A.正确
B.错误
[单项选择]There are examples of what can be done by the retailer within his store, but perhaps the biggest opportunity for cost-reduction stems from cooperation between manufacturer and distributor in analyzing the total costs involved in moving the product from the factory to the shopper’s basket. A helpful technique in this connection is the concept of "direct product profit" which is widely used in the United States.
This is a technique for analyzing very precisely the costs and profits associated with each product line, with a view to isolating opportunities for cost reduction. For example, the in-store handling costs for particular item may be reduced if the manufacturer puts it in a large case or reduces the number of layers in the case. With the growing importance of prepackaging both for perishable items like meat and for non-food products, it is essential that the container should facilitate quick unloading and easy display.
More obvious is the case for cooperation in reducing
A. was a "market-oriented" company
B. regarded distribution as the least important of costs
C. realized the importance of low distribution costs
D. streamlined the distribution system
[简答题]根据火灾发展的不同阶段,确定火灾探测器的类型选择,请简述如何做出选择?
[单项选择]分离度(R)表示相邻两色谱峰的分离程度,除另有规定外( )。
A. R=1.0
B. R≥1.0
C. R=1.5
D. R≤1.5
E. R>1.5
[单项选择]地球表面的两个基本地貌单元是()。
A. 山地.海岛
B. 海洋.陆地
C. 海洋.山地
D. 陆地.海岛
[单项选择]以下哪项不是先天性风疹综合征的先天缺陷()。
A. 白内障
B. 视网膜病
C. 听力丧失
D. 心脏病
E. 头围大,脑积水
[单项选择]男性,60岁,体重50kg,以往无心血管病史,走路不慎,滑人刚溶的石灰水中,两下肢烫伤。估计烫伤总面积是()
A. 20%
B. 30%
C. 40%
D. 50%
E. 55%

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