【填空题】
21. 在接触网支柱及接触网带电部分___m范围以内的金属结构上均须装设接地线。
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【填空题】
22. 用水或一般灭火器浇灭距牵引供电设备带电部分不足4m的燃着物体,牵引供电设备必须___。
【填空题】
23. 高处作业时不准上下投扔材料、___等。
【填空题】
24. 人员持有长大、飘动等物件,走近接触网下,不得高举挥动,应与牵引供电设备带电部分保持___m以上距离。
【填空题】
25. 不准戴妨碍___的眼镜、帽子。
【填空题】
26.严禁在运行的机车、车辆前抢越,严禁在机车车辆底部、端部,线路道心、钢轨、轨枕头、桥梁上和隧道内、电气化设施设备周围___或躲避风雨。
【填空题】
27.严格执行领车制度。不准在机车、车辆运行中提车钩、摘风管或___。
【填空题】
28.处理有压配件或制动联动装置故障应___,待排完风后方可作业。
【填空题】
29. 禁止探身于两车钩间提钩、摘管、开闭折角塞门或___。
【填空题】
30. 更换闸瓦必须关闭相应台车的截断塞门,并在制动机手柄上挂好___后方准作业。
【简答题】
机车乘务员在列车站停或区间停车下车检查机车走行部或处理故障时要做到那些?
【简答题】
电力机车运行中发生故障需要登机车顶部检查弓网状态或处理故障时,应做到?
【简答题】
机车乘务员在列车站停或区间停车下车检查机车走行部或处理故障时要做到那些?
【简答题】
运行途中弓网故障机车乘务员需登顶作业时应做到哪些?
【简答题】
发现事故隐患或不安全因素时要做到那些?
【简答题】
运行途中弓网故障机车乘务员需登顶作业时应做到哪些?
【单选题】
下列解锁scott账户的命令正确的是___。
A. update user scott account unlock
B. alter user scott account unlock
C. alter user scott unlock
D. alter user scott indentified by 123
【单选题】
下列哪一项不属于Oracle数据库的物理存储结构?___
A. 数据文件
B. 控制文件
C. 系统文件
D. 日志文件
【单选题】
下列用于储存字符串数据的数据类型是___。
A. vchar2
B. int
C. number
D. date
【单选题】
以下___内存区不属于 SGA。
A. PGA
B. 日志缓冲区
C. 数据缓冲区
D. 共享池
【单选题】
___模式存储数据库中数据字典的表和视图。
A. DBA
B. SCOTT
C. SYSTEM
D. SYS
【单选题】
在Oracle中,一个用户拥有的所有数据库对象统称为___。
A. 数据库
B. 模式
C. 表空间
D. 实例
【单选题】
以下哪个命令是SQL PLUS命令___。
A. UPDATE
B. EDIT
C. SELECT
D. ALTER TABLE
【单选题】
你要操纵Oracle数据,下列哪个不是SQL命令?___。
A. select * from dual
B. set define
C. update emp set ename=6543 where ename='SMITHERS'
D. create table employees(empid varchar2(10) primary key)
【单选题】
有一产品表(编号,名称,价格,数量,所属分类),下列语法不正确的是___ 。
A. select * from 产品表 where 价格>1000
B. select * from 产品表 where 编号,名称
C. select 所属分类,价格*数量 from 产品表 where 价格>1000
D. select 所属分类, 价格*数量,名称 from 产品表
【单选题】
使用以下哪种数据类型,可使数据131.14159保存为131.14___。
A. Number(6,2)
B. Number(3,2)
C. Number(2,3)
D. Number(2,5)
【单选题】
11、下列哪种说法有错___?
A. 数据块是逻辑存储结构中的最小逻辑单位
B. 表空间是数据库的最大逻辑划分单位
C. 数据块是Oracle存储分配的最小单位
D. 一个数据库文件智能对应一个表空间
【单选题】
下列对数据库的操作语句错误的是___。
A. create tablespace users dafafile'E:\users01' size 100M
B. create database emp
C. alter database emp
D. drop database emp
【单选题】
下列哪一控制语句有错___?
A. for…in..loop…End
B. if…then…else
C. if…then…elseif
D. if…then
【单选题】
下列不属于Oracle所支持的触发器为___?
A. 语句级触发器
B. 替换触发器
C. RS触发器
D. 系统触发器
【单选题】
DML触发器可分为三种类型,以下哪个不是DML触发器的类型___?
A. INSERT
B. UPDATE
C. DROP
D. ROP
【单选题】
以下选项中,预定义异常与产生原因对应错误的是___?
A. ACCESS_INTO_NULL--未初始化对象
B. CASE_NOT_FOUND--游标已经被OPEN
C. TOO_MANY_ROWS--执行select into时结果超过一行
D. ZERO_DIVIDE--除数为0
【单选题】
在Oracle中,下面用于限制分组函数的返回值的子句是___。
A. WHERE
B. HAVING
C. ORDER BY
D. 无法限定分组函数的返回值
【单选题】
在Oracle中,以下不属于集合操作符的是___。
A. UNION
B. SUM
C. MINUS
D. INTERSECT
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He is __________ of an actor. ___
A. anybody
B. anything
C. somebody
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You can take ______ seat you like. ___
A. no matter what
B. no matter which
C. what
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He changed his name, _____ that nobody would find out what he had done before. ___
A. having thought
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----- _______is your English teacher? ----- The one in red. ___
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Can you give me a light for my cigarette? I have ____my matches.___
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Then the speaker __________ the various factors leading to the present economic crisis.___
A. went for
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I know Jonathan quite well and never doubt_____ he can do a good job of it___.
A. whether
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I'm afraid it ______ tomorrow, but who knows?___
A. may have rained
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He has spent ____money on his new house.___
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This is the hotel __________ I like to stay.___
A. in which
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C. to which
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Would you mind keeping a(n)__________on the house for us while we are away?___
A. eye
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He suggested the sports meet be _______because of the bad weather. ___
A. put away
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If the weather is __________ suitable, we will play the football match on Tuesday. ___
A. by means of
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_____________is one of the five working languages at U.N. , which _______ are very proud of.___
A. The Chinese, the Chinese
B. Chinese language, Chinese
C. Chinese, the Chinese
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The war lasted so long that people were tired of it. Everyday there was large crowds of demonstrators _____against the war.___
A. protecting
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Tom is so talkative. I’m sure you'll soon get tired ________ him.___
A. of
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C. at
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He ________ driving me home, even though I told him I lived nearby.___
A. insisted on
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We came finally ______ the conclusion that she has been telling lies all the time.___
A. of
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I am not used to speaking ________ public.___
【单选题】
I didn’t know what to do, but then an idea suddenly ________to me.___
A. appeared
B. happened
C. occurred
D. emerged
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Measles (麻疹) ________ a long time to get over.___
A. spend
B. spends
C. take
D. takes
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A pair of spectacles ________ what I need at the moment.___
A. is
B. are
C. has
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I fell and hurt myself while I ________ basketball yesterday.___
A. was playing
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Don't forget _________ the window before leaving the room.___
A. to have closed
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Twenty people were______ wounded in the air crash.___
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The top of the Great Wall is ________ for five horses to go side by side.___
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Nancy is considered to be _________ the other students in her class.___
A. less intelligent
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C. intelligent as well
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She is not only my classmate __________ also my good friend.___
A. or
B. but
C. and
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I would like to do the job ________ you don't force me to study.___
A. in case
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C. though
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__________ she survived the accident is miracle.___
A. What
B. That
C. As
D. Which
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I often see _________ the road on his way home.___
A. he cross
B. him cross
C. him crossed
D. he crossing
【单选题】
The workers are busy __________ models for the exhibition.___
A. to make
B. with making
C. being making
D. making
【单选题】
The higher the temperature, __________ the liquid evaporates.___
A. the faster
B. the more fast
C. the slower
D. the more slower
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Australia is one of the few countries ___________ people drive on the left of the road.___
A. which
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C. where
D. on which
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The grey building is the place where the workers live, and the white building is the place where the spare parts _________ .___
A. are producing
B. are produced
C. produced
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Once environmental damage ___________, it takes many years for the system to recover.___
A. is to do
B. does
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We worked hard and completed the task ________.___
A. in the time
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C. ahead of time
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I didn't expect you to turn __________ at the meeting yesterday.___
A. up
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Mike is better than Peter _________ swimming.___
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Eggs, though rich in nourishments, have ___________ of fat.___
A. a large number
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D. the large amount