热门试题:
[判断题]场桥的跳水平台门未关好,小车可以动 ( )
A.正确
B.错误
[单选题]①我从梦中惊醒过来,睁开眼睛一望,原来自己并不是在太空船里,而是躺在床上②昨晚我做了一个梦,梦见自己坐上太空船,由一支火箭射入了太空③自太空船的右方看,是地球的边缘,上面盖着一层淡红色的霞光,既像轻烟,又像薄雾④太空的景象美极了:向上看,天不再是蓝色的,它变成了一幅黑色的星星望着我。太阳孤零零地停在左边,如同一团火球,放射出刺目的光芒⑤忽然,太空船机件失灵,从空中翻滚下坠。我望着太空船里成百个按钮,不知该按哪一个才好,一时手忙脚乱,急得大喊救命⑥我舒了一口气,心里还是扑扑跳个不停。只见月亮透过窗口,照在桌上,那里放着一本昨天新买的科学幻想故事书将以上6个句子重新排列,语序正确的是( )。
A.②④③⑤①⑥
B.②④③⑤⑥①
C.②③④⑤①⑥
D.①⑥②④③⑤
[不定项选择题]共用题干
Batteries Built by Viruses
What do chicken pox,the common cold,the flu,and AIDS have in common?They're all diseases caused by viruses,tiny microorganisms that can pass from person to person. It's no wonder that when most people think about viruses,finding ways to steer clear of viruses is what's on people's minds.
Not everyone runs from the tiny disease carriers,though. In Cambridge,Massachu- setts,scientists have discovered that some viruses can be helpful in an unusual way. They are putting viruses to work,teaching them to build some of the world's smallest rechargeable batteries.
Viruses and batteries may seem like an unusual pair,but they're not so strange for engi-neer Angela Beicher,who first came up with the idea. At the Massachusetts Institute of
Technology(MIT)in Cambridge,she and her collaborators bring together different areas of science in new ways.In the case of the virus-built batteries,the scientists combine what they know about biology,technology and production techniques.
Beicher's team includes Paula Hammond,who helps put together the tiny batteries,and
Yet-Ming Chiang,an expert on how to store energy in the form of a battery.“We're working on things we traditionally don't associate with nature,”says Hammond.
Many batteries are already pretty small. You can hold A,C and D batteries in your hand. The coin-like batteries that power watches are often smaller than a penny. However, every year,new electronic devices like personal music players or cell phones get smaller than the year before. As these devices shrink,ordinary batteries won't be small enough to fit in-side.
The ideal battery will store a lot of energy in a small package. Right now,Belcher's model battery,a metallic disk completely built by viruses,looks like a regular watch battery. But inside,its components are very small一so tiny you can only see them with a powerful microscope.
How small are these battery parts?To get some idea of the size,pluck one hair from your head. Place your hair on a piece of white paper and try to see how wide your hair is一 pretty thin,right?Although the width of each person's hair is a bit different,you could probably fit about 10 of these virus-built battery parts,side to side,across one hair. These micro-batteries may change the way we look at viruses.
What is Belcher's team doing at present?
A.It is finding ways to get rid of viruses.
B.It is mass-producing micro-batteries.
C.It is making batteries with viruses.
D.It is analyzing virus genes.
[判断题]一级化学防护服装储存期间,每半年进行全面检查一次,并摊平停放一段时间,同时密封拉链要打上蜡,完全拉开,再重新折叠,放入包装箱。( )(中)
A.正确
B.错误
[判断题]停电作业是在接触网带电部分附近的设备上进行的作业。
A.正确
B.错误
[多选题]现场抢救必须做到( )
A.A.迅速
B.B.准确
C.C.就地
D.D.坚持
[多选题]运输收入事故金额计算:()
A.现金、银行票据和坏帐损失按实际损失计算。
B.印有固定金额的票据按票面金额计算。
C.计算机软纸票按1000元计算。
D.包裹票等未印金额的票据按1000元计算。
[多选题]运行中的电力通信系统包括( )和( )的通信系统。
A.运行
B.备用
C.在线
D.离线
[判断题]Word文档可以用Windows附件中的记事本打开。()
A.正确
B.错误
[单选题]单孔跨径小于5m的称为( )。
A.小桥
B.通道
C.涵洞
D.以上均不正确
[单选题]持线路或电缆工作票进入变电站或发电厂升压站进行架空线路、电缆等工作,应( ),由变电站或发电厂工作许可人许可,并留存。
A.得到部门领导批准
B.持工作联系单
C.得到调度工作许可
D.增填工作票份数
[判断题](49075)( )运用客车车体倾斜一般不得大于50mm。( )(1.0分)
A.正确
B.错误
[单项选择]流行性出血热的主要预防措施是()
A. 防蚊、灭蚊
B. 防鼠、灭鼠
C. 加强个人卫生
D. 疫苗接种
E. 预防服药
[单选题]下列各项中,与留存收益筹资相比,属于吸收直接投资特点的是( )。
A.资本成本较低
B.不发生筹资费用
C.形成生产能力较快
D.筹资规模有限
[单项选择]第一心音特点()
A. 音调低,强度弱,性质低钝,持续时间短,通常只在儿童和青、少年可听到
B. 音调较低,强度较响,性质较钝,历时较长,与心尖搏动同时出现,心尖部听诊最清晰
C. 音调较高,强度较第一心音低,性质较第一心音清脆,在心尖搏动之后出现,心底部听诊最清楚
D. 低调、沉浊、很弱,心尖部及其内侧较明显
E. 音调高、历时短促而响亮、清脆,呈拍击样,在心尖内侧较清楚
[单选题]E-K-002 4 2 3
《高速铁路有砟轨道线路维修规则》第5.5.1条规定:道岔基本轨、尖轨、辙叉及导轨伤损更换后但未焊接时,应限速不超过( )km/h,并应尽快恢复原结构。
A.60
B.80
C.120
D.160
[单选题]食管癌中晚期的典型症状
A.胸骨后烧灼感
B.食管内异物感
C.咽下食物哽噎感
D.咽下食物停滞感
E.进行性咽下困难
[多选题]行政机关逾期未对被许可人依法提出的延续行政许可的申请作出决定,下列说法错误的是:()
A.视为准予延续
B.行政机关不予办理准予延续的手续
C.行政机关可以事后作出不予延续的决定
D.行政机关可以告知被许可人重新提出行政许可申请
[单选题]为保证环状给水管网的水源,向环状管网输水的输水管不应少于( )( 易 )
A.一条
B.两条
C.三条
D.四条
[多选题]火场内攻前应当做好哪些安全检查?( )【多选题】
A.检查空气呼吸器压力,估算使用时间。
B.检查灭火防护服穿戴是否齐全规范。
C.检查是否佩戴阻燃头套。
D.检查头灯是否打开。
E.检查呼救器是否打开。
F.检查对讲机频道、信号和电量,测试通信效果。
[单项选择]某单位利用业余时间举行了3次义务劳动,总计有112人次参加,在参加义务劳动的人中,只参加1次、参加2次和3次全部参加的人数之比为5:4:1。问该单位共有多少人参加了义务劳动
A. 70
B. 80
C. 85
D. 102
[单选题] 作业人员对本规程应( )考试一次。
A.每半年
B.每年
C.每两年
D.每三年
[单选题]阻值分别为R和2R的两只电阻串联后接入电路,则阻值小的电阻发热量是阻值大的电阻发热量的( )倍。
A.1
B.44198
C.2
D.44199
[单选题] 根据《公路土工试验规程》JTG 3430-2020,( )方法适用于现场测定粗粒土的密度。
A.环刀法、蜡封法
B.蜡封法、灌水法
C.灌砂法、灌水法
D.蜡封法、灌砂法
[单项选择]M国的一个动物保护组织正努力改变长期以来把蝙蝠看作一种令人恐怖的动物的观念。该组织争论说蝙蝠让人害怕和烦乱仅仅因为它们见人就躲避,且仅在夜间活动。
以下哪项如果是正确的,将对该组织的争论的准确性提出最严重的质疑?()
A. 蝙蝠逐渐失去了它们天然的栖息之处,如洞穴和中空的树,因此逐渐到人口更密集的地区寻找栖息之处
B. 人们对其他的非常令人害怕的动物,如狮子、短吻鳄和蛇的行为的了解多于对蝙蝠的行为的了解
C. 在M国以外的其他地区,蝙蝠也被视为是一种令人恐怖的动物
D. 浣熊和猫头鹰也是见人就躲避,且只在夜间活动,然而一般来说它们并不让人害怕和烦乱
[单项选择]()是目前电力系统主要通信方式之一。
A. 模拟载波
B. 电力线载波
C. 数字微波通信
D. 卫星通信
[判断题]电缆敷设方式的选择,应视工程条件、环境特点和电缆类型、数量等因素,以及满足运行可靠、便于维护和技术济合理的原则选择。( )
出处:B/T50217-2007《电力工程电缆设计规范》5.2.1
A.正确
B.错误
[判断题]采取多种形式开展宣传教育和培训工作,保证各级各单位责任人和所有相关人员了解应急预案内容,熟悉应急职责、应急处置流程和保障措施,提高避险逃生、自救互救和应急处置能力。( )
A.正确
B.错误
[单项选择]在下列情况中,可对所涉及土地使用权提前收回的是()。
A. 开发商李某拥有的土地闲置了1年
B. 开发商张某受政府委托对城市某一主要道路进行市政设施改造需占用沿道路两侧部分用地
C. 开发商王某以2000万元价格向另一开发商周某转让一块土地,但仅按1000万元向政府申报成交价
D. 开发商孙某购买一块土地后出国定居
[判断题]电力企业应当对电力设施定期进行检查和试验,保证其正常运行。( )
A.正确
B.错误
[判断题]汽车式起重机行驶时,上车操作室不得坐人。
A.正确
B.错误
[单选题]口腔念珠菌病致病菌中最主要、毒力最强的病原菌为 ( )
A.热带念珠菌
B.假热带念珠菌
C.近平滑念珠菌
D.高里念珠菌
E.白色念珠菌
[单项选择]How to approach Listening Test Part Three
· In this part of the Listening Test you listen to a long conversation or interview and answer eight questions.
· Before you listen, read the questions. Think what the recording will be about.
· Note all possible answers as you listen for the first time. Do not make an immediate decision. Do not worry if you do not know the answers. You will hear the recording a second time.
· Listen for overall meaning. Do not choose an answer just because you hear the same words in the recording as in the question.
· Decide on your final answer only after you have listened for the second time.
· You will hear a radio interview with Carolyn Whitcombe about the business consultancy which she runs.
· For each question 23 - 30, mark one letter A, B or C for the correct answer.
· You will hear the recording twice.According to Carolyn, how has the work of her consultancy changed A. It involves producing more documentation for clients. B. It in
[判断题]温度对tanδ测试结果具有较大影响,一般同一被试设备,tanδ随温度的升高而升高。
A.正确
B.错误
[多选题](类别:号段管理难度:中等)下面关于请教式开场白的说法错误的是:()
A.通过向客户请教问题,利用某些客户喜欢指导和教育别人的习惯,引起客户注意
B.虚心请教客户,要对准客户的长处和爱好或者兴趣进行设计
C.就是自己明知道的知识,装作不知道,然后请教客户
D.请教式开场白是最有效的开场白