【单选题】
It takes me _______ hour to do it.
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【单选题】
His school is 20 kilometers _______ from my school but we meet every week.
A. far
B. away
C. to
D. far to
【单选题】
—_______ is it from the village to your farm?
—About 10 minutes' walk.
A. How often
B. How soon
C. How long
D. How far
【单选题】
—How _______ does it take to get to school?
—It takes about 15 minutes.
A. long
B. much
C. many
D. far
【单选题】
—How does that boy go to school?
—_______.
A. In a ropeway
B. By a ropeway
C. On a ropeway
D. On ropeway
【单选题】
This is _______ boy.
A. a 11 years old
B. an 11-year-old
C. a 11-year-old
D. an 11 years old
【单选题】
The river runs ______ so we are afraid ______ the river.
A. quick;to cross
B. quickly;cross
C. quickly;to cross
D. quick;cross
【单选题】
It usually takes me about 20 minutes _______ my homework every day.
A. do
B. does
C. to do
D. doing
【单选题】
It's not easy _______ school on a ropeway.
A. to go
B. to go to
C. go
D. go to
【单选题】
—How are you going to the train station to meet your aunt?
—I'm going there _______ car.
【单选题】
Sam has a bike. He ______ it to school every day.
A. takes
B. rides
C. walks
D. drives
【单选题】
Our holiday is coming. Two _______ students of our school want to have a trip.
A. hundred
B. hundreds
C. hundred of
D. hundreds of
【单选题】
Look!There is _______ boy over there. Do you know him?
A. a 8-year-old
B. an 8-year-old
C. a 8 years old
D. an 8 years old
【单选题】
Kate is _________ girl. She's very happy at school.
A. a eight-year-old
B. a eight-years-old
C. an eight-years-old
D. an eight-year-old
【单选题】
Mike usually goes to school_________subway.
【单选题】
—Is this your bike,Jane?
—Yes,it is. I_________it to school every day.
A. get
B. ride
C. take
D. drive
【单选题】
Mom,my schoolbag is too old. Can you buy me a_________one?
A. new
B. big
C. small
D. short
【单选题】
Tina likes music and her_________is to be a great musician.
A. habit
B. work
C. dream
D. name
【单选题】
I'm busy today,so I'm_________that I can't go to your party in the afternoon.
A. happy
B. afraid
C. right
D. free
【单选题】
The workers will build a new railroad _________ the two cities.
A. since
B. between
C. as
D. during
【单选题】
We need to buy some fruit_________apples,pears and bananas.
A. about
B. with
C. like
D. for
【单选题】
It_________me about two hours to do my homework every evening.
A. takes
B. makes
C. needs
D. asks
【单选题】
—_________does your father go to work?
—He takes the bus.
A. What
B. How
C. When
D. Why
【单选题】
—John will go to the USA.Is that_________?
—Yes. He wants to see his grandparents.
A. true
B. easy
C. same
D. big
【单选题】
—How do they_________the river?
—By boat.
A. find
B. know
C. think
D. cross
【单选题】
—_________is it from here to the bus stop?
—About five minutes' walk.
A. How long
B. How much
C. How old
D. How far
【单选题】
—What do you_________the TV show?
—It's boring.I don't like it.
A. come on
B. think of
C. talk to
D. play with
【单选题】
I don't know_________.Can you tell me?
A. where she live
B. where does she live
C. where she lives
D. where do she live
【单选题】
Mr. Brown has ___________ eight-year-old daughter.
【单选题】
Jill's father usually goes to work ___________ car.
【单选题】
On the table,I see lots of fruit ___________ apples,bananas and oranges.
A. like
B. for
C. with
D. about
【单选题】
Half of one hundred is ___________.
A. fifty
B. sixty
C. eighty
D. ninety
【单选题】
My bag is too old. I need to buy a ___________ one.
A. big
B. new
C. tidy
D. easy
【单选题】
I'm busy today,so I'm ___________ I can't go to your birthday party.
A. cool
B. happy
C. free
D. afraid
【单选题】
—My ___________ is to be a teacher.
—I think it can come true.
A. dream
B. job
C. work
D. habit
【单选题】
—How long does it ___________ them to finish the work?
—About three hours.
A. get
B. take
C. need
D. make
【单选题】
The ___________ girl can play the piano well.
A. seven years old
B. seven-years-old
C. seven-years old
D. seven-year-old
【单选题】
—There is no bridge over the river. How can we ___________ it?
—By boat.
A. draw
B. find
C. clean
D. cross
【单选题】
—What do you __________ the story?
—It's funny.
A. talk to
B. look at
C. play with
D. think of
【单选题】
In my room,the bed is ___________ the table ________ the sofa.
A. from;to
B. either;or
C. between;and
D. because;so
【单选题】
—___________ is it from your home to school?
—Five kilometers.
A. How much
B. How old
C. How far
D. How long
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【单选题】
静液压系统中,将液体的势能转换为机械能驱动冷却风扇旋转的部件为___ 。
A. 静液压泵
B. 静液压马达
C. 温度控制阀
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静液压系统的___是该系统的控制元件,起着自动控制冷却风扇变速的作用。
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下列哪些部件属于联合调节器的功率调节机构。___
【单选题】
柴油机冒蓝烟是因为:___。
A. 柴油机整定功率过高
B. 刮油环装反或刮油性能差
C. 冷却水温过高
【单选题】
柴油机冒白烟是因为:___。
A. 进气系统故障
B. 燃油中含有水分
C. 喷油器雾化不良
【单选题】
当机车空气滤清器太脏,柴油机进气压力降低时,将导致机车___。
A. 功率不足
B. 柴油机敲缸
C. 柴油机悠车
【单选题】
柴油机工作时,气缸壁上的油随着活塞的往复运动进入燃烧室,这种现象称为气环的___作用。
【单选题】
如果柴油机___过小,气阀受热膨胀后,将使气阀关闭不严,而发生漏气回火放炮等故障。
【单选题】
各喷油泵齿条实际拉出刻线差别太大时,会引起柴油机___
A. 冒蓝烟
B. 排气温度过高
C. 增压器喘振
【单选题】
机车运行中,哪些原因会引起增压器喘振:___。
A. 柴油机过载
B. 油水温度过低
C. 中冷水温低于45℃
【单选题】
喷油泵柱塞的上下往复运动是借助___的旋转实现的。
【单选题】
机车喷机油的原因有:___。
A. 柴油机供油量过大
B. 柴油机呼吸口堵塞
C. 增压器漏油
【单选题】
柴油机工作时,出现水温过高的原因有:___
A. 冷却风扇不转或转速低
B. 柴油机漏水
C. 润滑不良
【单选题】
膨胀水箱有油的原因有:___。
A. 热交换器泄漏
B. ,气缸盖裂损
C. 增压器漏油
【单选题】
机车上的组合式控制电器有:___。
A. 琴键开关
B. 司机控制器
C. 电磁接触器
【单选题】
中间继电器2ZJ的作用之一为:___。
A. 控制LLC线圈电路
B. 切断励磁机的励磁电路
C. 控制水温高信号灯3XD电路
【单选题】
机车上自动开关的作用是:___。
A. 防止电压过高
B. 自动保护和开关作用
C. 接通电路
【单选题】
启动滑油泵电机熔断器3RD的容量为:___
【单选题】
机车上装有两个110V、8W的接地试灯,试灯的—端与蓄电池的正端相接的称为___。
【单选题】
磁场削弱电阻烧损的原因有:___。
A. 主发电机电流过大
B. 牵引电动机励磁绕组短路
C. 牵引电动机主极连线断路
【单选题】
运行中蓄电池放电的原因有:___。
A. QF转入固定发电
B. 熔断器2RD烧损
C. 熔断器1RD烧损
【单选题】
闭合启动机油泵开关3K,QBC吸合,QBD不动作时,应检查___
A. 3RD或QBC主触头
B. 15DZ
C. 3K开关
【单选题】
闭合燃油泵开关,RBC不吸合时,应检查___。
A. 16DZ
B. 3~4DZ
C. RBC线圈电路
【单选题】
当1YD或2YD电枢中的___为零,空压机工作时,造成熔断器4RD或5RD
【单选题】
运行中由于___,启动发电机会突然转入固定发电。
A. 1DZ跳开
B. 2RD烧损
C. 电压调整器故障
【单选题】
柴油机启动时,受___控制使启动机油泵工作45~60S后
【单选题】
走车电路中设置1~3ZJ及DJ、LJ常闭触头是控制___
【单选题】
闭合蓄电池闸刀XK,卸载信号灯7XD不亮的原因有___
A. Lc常闭触点不良
B. 6Dz分位 LLC吸合
【单选题】
闭合蓄电池开关XK,电压表无显示的原因___
A. 1Rd烧损
B. 蓄电池亏电
C. 蓄电池有反极现象
【单选题】
运行中,启动发电机停止发电的原因有___
A. 自动开关2DZ跳开
B. FLC线圈电路故障
C. 转入固定发电
【单选题】
主手柄从0位提到1位,机车不换向的原因为:___。
A. 换向电路有接地点
B. 低压风缸风压不足500kPa
C. 1-6C的常闭触头任一虚接
【单选题】
固定发电工况下,启动发电机的端电压在柴油机达到额定转速时,才可达到___。
【单选题】
功率电阻在减载极限位时,Cf有___的励磁电流。
【单选题】
励磁电路中,电阻___的整定值决定了同步牵引发电机的最高电压限制。
【单选题】
磁场削弱自动不能过渡,手动过渡正常时,为___故障。
A. 1ZJ常闭触头
B. 过渡装置
C. 1~2XC线圈
【单选题】
启机后闭合5K,辅助发电机电压显示11OV,蓄电池充放电电流表显示放电的原因是:___。
A. 2RD烧损
B. QC犯卡、烧结不释放
C. 逆流装置NL故障
【单选题】
走车电路中某电器线圈烧损短路时,主手柄l位___跳开。
【单选题】
使用接地开关DK及故障开关GK,均无法排除DJ动作时的原因是:___。
A. 主电路正端大线接地
B. 接地继电器DJ故障
C. 低电位点接地