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【单选题】
Part B Directions: You will hear 3 conversations or talks and you must answer the questions by choosing A, B, C or D. You will hear the recording ONLY ONCE. 听力原文: Right, everybody. Welcome to Central College library services. My name's Kathy Jenkins. I'll give you a brief introduction to the library. We have a well-stocked bank of resources which are located in three main places: the library itself, with books and periodicals the self-access language centre, with audio and video material and the micro-computer lab. I'll start with the micro-computer lab, or micro-lab as we call it. It is fitted with 24 personal computers. If you are a member of the library, you may borrow CALL discs in French, German, Italian, Spanish and Russian as well as English. By the way, CALL stands for computer aided language learning: C-A-double L, 'CALL' , for short. You may also borrow a range of word processing and desktop publishing packages. All disks are, of course, strictly for use in the micro-lab only. If you wish to print anything you should use one of the five machines around the outside of the room. Four are connected to dot matrix printers, one is connected to the laser printer. If you want a better quality printout from the laser printer, come and see me or any of the library staff. Dot-matrix printouts are free but there is a charge for using the laser printer. There is always a queue to get to the terminals towards the end of term. Come in and get to know how to use the computers early in the term and use them regularly, rather than just before exams and essay deadlines, in order to avoid delay or disappointment. Training sessions are held on a regular basis, on the first and third Thursday of each month, and are free to full-time students of the college. See you there. Now, any questions? What does the speaker suggest that the students should do during the term?
A.
Consult with her frequently.
B.
Use the computer regularly.
C.
Occupy the computer early.
D.
Wait for one's turn patiently.
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【单选题】车站技术作业图表中调机动态代号待命的符号是()。
A.
Q
B.
D
C.
B
D.
S
【简答题】在下列电路中,使用电阻来起到保护LED电路,LED端电压降为2.2V,我们通常将流经LED的电流限制为20mA。那么该电阻的阻值最小为____欧姆。
【单选题】电阻器在 LED 电源线中的作用是什么
A.
电阻器总是与 LED 并联连接且限制电压。
B.
电阻器限制电流并防止 LED 损坏
C.
电阻器用于减少车载电气系统中的耗电量
【单选题】车站技术作业图表中调机动态代号上煤的符号是()。
A.
G
B.
X
C.
D
D.
M
【单选题】1 已知 发光二极管采用电阻限流电路,电源 U cc =5V , LED 正向压降 U led =2V ,要求电流 I=2mA ,试计算限流电阻 R 。
A.
2k Ω
B.
1.5k Ω
C.
3k Ω
D.
7.5k Ω
【单选题】25岁男性患者发现肉眼血尿,则其1L尿中含血:( )
A.
≥1ml
B.
0.5ml
C.
≥2ml
D.
≥3ml
E.
以上都不是
【判断题】合同的适当履行就是要求项目合同的当事人按照合同规定的目标来履行。
A.
正确
B.
错误
【简答题】某电路需要安装LED电源指示灯,电源电压是交流220V,请选择LED 的限流电阻的阻值。
【单选题】质量是指一组固有特性满足要求的( )
A.
水平
B.
程度
C.
满意度
D.
适用度
【单选题】穿越正线调车,在调车计划上必须注明穿越正线符号,中间站(比照区段站办理的除外)还须注明()
A.
穿正时间
B.
旅客列车车次
C.
钩分标准
D.
列车车次
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