相关试题
【多选题】
计量检定的对象是计量器具，包括___。
A. 计量内容#
B. 计量标准#
C. 工作计量器具#
D. 标准物质
【多选题】
便携式瓦斯仪表有三类：___。
A. 热效式#
B. 热导式#
C. 光导式#
D. 化学式
【多选题】
测量仪器的基本性能是指衡量仪器测量能力的指标，如___等。
A. 准确度#
B. 灵敏度#
C. 重复性#
D. 稳定性
【多选题】
计量器具控制包括___。
A. 出厂检定#
B. 首次检定#
C. 使用中检验#
D. 报废检定
【多选题】
计量是实现单位统一，量值准确可靠的活动，其全面特点是___。
A. 准确性#
B. 一致性#
C. 溯源性#
D. 法律性
【多选题】
光的基本规律有哪些___。
A. 光的直线传播规律#
B. 光的独立传播规律#
C. 光反射定律#
D. 光的折射定律
【多选题】
为了防止便携式甲烷检测元件中毒，应尽量避免便携式瓦斯检测仪在___的环境中使用。
A. 一氧化碳#
B. 硫化氢#
C. 二氧化硫#
D. 甲烷
【多选题】
便携式甲烷报警仪开机，仪器不工作的原因有___。
A. 开关连线断开#
B. 电池组连线断开#
C. 电子开关坏#
D. 电池组电压降低为零
【多选题】
便携式甲烷报警仪显示值不稳定，原因有___。
A. 黑白元件虚焊#
B. 巷道内瓦斯含量过高#
C. 调零电位RP1内部接触不良#
D. 电池电量不足
【多选题】
矿井瓦斯爆炸产生的有害因素是___。
A. 电磁辐射#
B. 高温#
C. 冲击波#
D. 有害气体
【多选题】
煤炭自然发火分为3个阶段，即___。
A. 潜伏期#
B. 自热期#
C. 燃烧期#
D. 轰然期
【多选题】
煤矿中常见的灾害是___、煤尘爆炸、顶板事故等。
A. 静电#
B. 矿井水灾#
C. 矿井火灾#
D. 瓦斯爆炸
【多选题】
隔离式自救器有化学氧自救器和压缩氧自救器两种。它们可以防护下列___有害气体。
A. H2S#
B. SO2#
C. CO#
D. NO2
【多选题】
对井下受伤的人员做人工呼吸前的准备工作，先将伤员撤到___的地方。
A. 安全#
B. 大巷#
C. 通风#
D. 硐室
【多选题】
瓦斯检查的“三对口”指的是___上面填记的有关情和数据完全一致。
A. 记录牌板#
B. 检查手册#
C. 瓦斯台帐#
D. 瓦检巡回图表
【多选题】
我国煤矿常用的瓦斯抽放泵有___种。
A. 水环式真空泵#
B. 离心式瓦斯泵#
C. 回转式瓦斯泵#
D. 干式瓦斯抽放泵
【多选题】
煤矿重大灾害事故都有___其共同的特性。
A. 突法性#
B. 灾难性#
C. 破坏性#
D. 继发性
【多选题】
矿井防尘湿式作业的优点是___。
A. 简单易行#
B. 费用小#
C. 效果好#
D. 安全
【多选题】
便携式瓦斯检查仪的缺点是缺点是：___。
A. 元件寿命短#
B. 元件寿命长#
C. 测量范围小#
D. 测量范围大
【多选题】
甲烷在空气中燃烧生成：___。
A. 二氧化碳#
B. 水#
C. 一氧化碳#
D. 氧气
【多选题】
信号分为：___两种。
A. 模拟信号#
B. 数字信号#
C. 有源信号#
D. 无源信号
【多选题】
正弦交流电的三要素是指正弦量的___。
A. 平均值#
B. 最大值#
C. 角频率#
D. 周期
【多选题】
井下设备交流电源有___。
A. 127V#
B. 220V#
C. 380V#
D. 660V
【多选题】
安全监控系统主机应有___供电。
A. 双回路#
B. 交流电#
C. 后备电源#
D. 直流电
【多选题】
煤矿安全规程中规定，采掘工作面的瓦斯浓度检查次数应符合如下___。
A. 低瓦斯矿井中每班至少1次#
B. 低瓦斯矿井中每班至少2次#
C. 高瓦斯矿井每班至少2次#
D. 高瓦斯矿井每班至少3次
【多选题】
矿井主要提升装置必须具备下列资料___，妥善保存。
A. 绞车说明书#
B. 电气系统图#
C. 绞车总装配图#
D. 制动装置结构图
【多选题】
新钢丝绳悬挂使用前，必须对每根钢丝绳做___试验。
A. 拉断#
B. 弯曲#
C. 破坏#
D. 扭转
【多选题】
下列哪些地点必须设置风速传感器。___
A. 突出煤层采煤工作面回风巷#
B. 采区回风巷#
C. 一翼回风巷#
D. 掘进工作面进风流
【多选题】
交变电是___的总称。
A. 交变电动势#
B. 交变电功率#
C. 交变电压#
D. 交变电流
【多选题】
稳压二极管的主要参数有___。
A. 稳定电压#
B. 工作电流#
C. 额定电压#
D. 工作电压
【多选题】
影响载体催化元件灵敏度的主要因素有___。
A. 催化剂衰老#
B. 催化层形态构造变化#
C. 载体表面积减小#
D. 催化剂中毒
【多选题】
三极管有___三种状态。
A. 截止#
B. 放大#
C. 缩小#
D. 饱和
【多选题】
三极管有___两个作用。
A. 放大#
B. 开关#
C. 截止#
D. 饱和
【多选题】
矿用信息传输接口的技术指标应包括___。
A. 至分站之间最大传输距离不小于10km
B. 接口所能接入分站的数量宜在8、16、32、64、128中选取#
C. 将模拟量信号转换为数字量信号进行传输#
D. 独立设备的接口至主机之间最大传输距离不小于5m
【多选题】
矿用信号转换器的技术指标应包括___。
A. 模拟量频率型信号的频率范围：200～1000Hz#
B. 模拟量信号转换处理误差应不大于5%#
C. 模拟量电流型信号范围：100～500mA#
D. 信号转换时间应不大于2s
【多选题】
双通道斩波式直流放大器由___组成。
A. 斩波通道#
B. 低频通道#
C. 高频通道#
D. 主放大器
【多选题】
7805三端稳压集成电路将电源稳定在5V，用来给___供电。
A. 单片机#
B. V/F转换#
C. 检测元件#
D. 声光报警器
【多选题】
34063芯片组成的开关电源用来给___供电。
A. 单片机#
B. 信号输出#
C. 检测元件#
D. 数据显示
【多选题】
数字频带传输系统由___组成。
A. 信道信号形成器#
B. 信道#
C. 接收滤波器#
D. 抽样判决电路
推荐试题
【单选题】
According to the passage sport is positive for young people in that __________.___
A. it can help them learn more about society
B. it enables them to find flaws in themselves
C. it teaches them how to set realistic goals for themselves
D. it can provide them with valuable experiences
【单选题】
Many coaches and parents are in the habit of criticizing young athletes __________.___
A. without realizing criticism may destroy their self-confidence
B. in order to make them remember life's lessons
C. believing that criticism is beneficial for their early development
D. so as to put more pressure on them
【单选题】
According to the passage parents and coaches should __________.___
A. help children to win every game
B. pay more attention to letting children enjoy sports
C. train children to cope with stress
D. enable children to understand the positive aspect of sports
【单选题】
The author's purpose in writing the passage is _________.___
A. to persuade young children not to worry about criticism
B. to stress the importance of positive reinforcement to children
C. to discuss the skill of combining criticism with encouragement
D. to teach young athletes how to avoid burnout
【单选题】
As pointed out at the beginning of the passage, people used to think that air pollution _______.___
A. cause widespread damage in the countryside
B. affected the entire eastern half of the United States
C. had damaged effect on health
D. existed merely in urban and industries areas
【单选题】
As to the greenhouse effect, the author ________.___
A. share the same view with the scientist
B. is uncertain of its occurrence
C. rejects it as being ungrounded
D. thinks that it will destroy the world soon
【单选题】
The underlined word "offset" in the second paragraph could be replaced by _________.___
A. slip into
B. make up for
C. set up
D. catch up with
【单选题】
It can be concluded that ____________.___
A. raising the world's temperature only a few degrees would not do much harm to life on earth
B. lowering the world's temperature merely a few degrees would lead major farming areas to disaster
C. almost no temperature variations have occurred over the past decade
D. the world's temperature will remain constant in the years to come
【单选题】
This passage is primarily about __________.___
A. the greenhouse effect
B. the burning of fossil fuels
C. the potential effect of air pollution
D. the likelihood of a new ice age
【单选题】
What is the major function of paragraph 1?___
A. To arouse the reader's concern.
B. To introduce the theme of the whole passage.
C. To summarize the whole passage.
D. To state the primary uses of TV.
【单选题】
Television, as a source of entertainment, is ________.___
A. not very convenient
B. very expensive
C. quite dangerous
D. relatively cheap
【单选题】
Why are some people against TV?___
A. Because TV programs are not interesting.
B. Because TV viewers are totally passive.
C. Because TV prices are very high.
D. Because TV has both advantages and disadvantages.
【单选题】
One of the most obvious advantages of TV is that _________.___
A. it keeps us informed
B. it is very cheap
C. it enables us to have a rest
D. it controls our lives
【单选题】
According to the passage, whether TV is good or not depends on ___________.___
A. its quality
B. people's attitude towards it
C. how we use it
D. when we use it
【单选题】
What regulation was issued by New York State concerning beverage containers?___
A. A fee should be charged on used containers for recycling.
B. Throwaways should be collected by the state for recycling.
C. Consumers had to pay for beverage containers and could get their money back on returning them.
D. Beverage companies should be responsible for collecting and reusing discarded plastic soda bottles.
【单选题】
The returned plastic bottles in New York used to _____________.___
A. be turned into raw materials
B. be separated from other rubbish
C. have a second-life value
D. end up somewhere underground
【单选题】
The key problem in dealing with returned plastic beverage containers is ______________.___
A. how to reduce their recycling costs
B. to sell them at a profitable price
C. how to turn them into useful things
D. to lower the prices for used materials
【单选题】
Recycling has become the first choice for the disposal of rubbish because ______________.___
A. recycling causes little pollution
B. other methods are more expensive
C. recycling has great appeal for the jobless
D. local governments find it easy to manage
【单选题】
It can be concluded from the passage that ____________.___
A. recycling is to be recommended both economically and environmentally
B. local governments in the U.S. can expect big profits from recycling
C. rubbish is a potential remedy for the shortage of raw materials
D. landfills will still be widely used for waste disposal
【单选题】
The author chose to study engineering at a small liberal-arts university because he ________.___
A. intended to be a sensible student with noble ideals
B. wanted to be an example of practicality and rationality
C. intended to be a combination of engineer and humanist
D. wanted to coordinate engineering with liberal-arts courses in college
【单选题】
According to the author, by interacting with people who study liberal arts, engineering students can __________.___
A. broaden their horizons
B. receive guidance in their careers
C. become noble idealists
D. balance engineering and the liberal arts
【单选题】
In the eyes of the author, a successful engineering student is expected ______________.___
A. to be imaginative with a value system to guide him
B. to be a technical genius with a wide vision
C. to have an excellent academic record
D. to be wise and mature
【单选题】
The author's experience shows that he was ________.___
A. creative
B. ambitious
C. irrational
D. unrealistic
【单选题】
The underlined word "they" in "... together they threaten to confuse." (Para.5) refers to ____________.___
A. practicality and rationality
B. engineering and the liberal arts
C. reality and noble ideals
D. flexibility and a value system
【单选题】
It can be learned from the passage that the Ouchidas' house __________.___
A. failed to meet energy conservation standards
B. was designed and constructed in a scientific way
C. is well worth the money spent on its construction
D. is almost faultless from the point of energy conservation
【单选题】
What made the Ouchidas' new house a horrible dream?___
A. Lack of fresh air.
B. Gas leakage in the kitchen.
C. The newly painted walls.
D. Poor quality of building materials.
【单选题】
The underlined word "accentuate" (Para. 3) most probably means "________".___
A. worsen
B. accelerate
C. relieve
D. improve
【单选题】
Why were cracks in old houses not a big concern?___
A. Because environmental protection was given top priority.
B. Because indoor cleanness was not emphasized.
C. Because they were technically unavoidable.
D. Because energy used to be inexpensive.
【单选题】
This passage is most probably taken from an article entitled "_________".___
A. Energy Conservation
B. Air Pollution Indoors
C. House Building Crisis
D. Traps in Building Construction
【单选题】
We need to plan ahead in order to ___________.___
A. keep a record of all the events
B. better organize our activities
C. store everything in our head
D. pile up little tasks neatly
【单选题】
Strategic times are best for us to ___________.___
A. save energy
B. check e-mails
C. study efficiently
D. organize activities
【单选题】
Which of the following could be used as a motivation to do our assignments?___
A. Remembering our urgent tasks.
B. Any activities we're eager to do.
C. Taking a break in the afternoon.
D. The promise to study efficiently.
【单选题】
What can help us to keep refreshed throughout the day?___
A. Doing some physical exercise.
B. Taking a short nap in the afternoon.
C. Rushing through some assignments.
D. Playing a game of chess with a friend.
【单选题】
Which of the following could be the best title for this article?___
A. Study Habits and Time Management
B. Business Management and Leadership
C. University Education and Campus Life
D. Life Goals and Academic Development
【单选题】
It is implied in the text that it is hard to ________.___
A. carry life learning though
B. tell the nature of life learning
C. learn without going to school
D. find a specially trained teacher
【单选题】
According to the author, the schooling framework often ________.___
A. produces slow students with poor memories
B. ignores some parts of the official curriculum
C. fails to provide enough knowledge about life
D. gives little care to the quality of teaching materials
【单选题】
Life learners recognize that learning will not be difficult if they are _________.___
A. clear about why to learn
B. careful to make a time table
C. able to respect other people
D. cautious about any mistakes
【单选题】
According to the author, life learning ________.___
A. could prevent one from running risks
B. could be a road full of trials and errors
C. makes a kid independent of his parents
D. teaches a kid how to avoid being scorned
【单选题】
Through life learning, children ________.___
A. will grow without the assistance from parents
B. will learn to communicate with the real world
C. will be driven to learn necessary life knowledge
D. will be isolated from the negative side of society
【单选题】
A good title for this passage is __________.___
A. Sleep
B. Good Health
C. Dreams
D. Work and Rest
