相关试题
【判断题】
企业双体系建设过程中,风险等级判定应遵循从宽从低的原则。
【单选题】
I often _______ to work.
A. ride my bike
B. by bike
C. on bike
D. by a bike
【单选题】
—_______ Lin Tao go to Hangzhou?
—By taxi.
A. How
B. How do
C. How does
D. How far
【单选题】
There is a small house in the middle of the lake.
You can get there _______.
A. by boat
B. by subway
C. by bus
D. on foot
【单选题】
Most of us _______ bikes to school.
A. takes
B. rides
C. take
D. ride
【单选题】
---I walk to school every day,_______?
--- I ride my bike.
A. How are you
B. What are you
C. How about you
D. How old are you
【单选题】
—_______ do you usually go to work?
—By bike.
A. How long
B. How far
C. How
D. When
【单选题】
—_______ do you do sports every day?
—For about four hours.
A. How many
B. How long
C. How far
D. How soon
【单选题】
—_______ is it from here to the train station? —About six kilometers.
A. How long
B. How far
C. How much
D. How many
【单选题】
I often go to work _______.
A. by bike
B. by a bike
C. ride the bike
D. on bike
【单选题】
It usually takes Jim three hours _______ the homework.
A. finish
B. finishing
C. to finish
D. finishes
【单选题】
—How can I go to the supermarket,Paul?
—_______ bike. It's not far from here.
A. On
B. By
C. In
D. With
【单选题】
—Lily is coming by ______ plane tomorrow.
—Let's go to ______ airport to meet her.
A. a;a
B. /;a
C. the;the
D. /;the
【单选题】
Her parents go to work ______ bus every morning.
【单选题】
—_______ is it from Beijing to Tianjin?
—It's about 137 kilometers.
A. How far
B. How long
C. How fast
D. How much
【单选题】
—_______ Jenny ______ to school?
—No,she doesn't.She goes by bike.
A. Does;walk
B. Does;on foot
C. Do; take
D. Do; by train
【单选题】
It takes me _______ hour to do it.
【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
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汽轮机冷态启动定速并网后加负荷阶段容易出现负胀差
【判断题】
并列运行的汽轮发电机组间负荷经济分配的原则是按机组汽耗(或热耗)微增率从小到大依次进行分配
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当转子在第一临界转速以下发生动静摩擦时,对机组的安全威胁最大,往往会造成大轴永久弯曲
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汽轮机静止部分主要包括基础、台板、汽缸、喷嘴、隔板、汽封、轴承等
【判断题】
主蒸汽管道保温后,可以防止热传递过程的发生
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【判断题】
室内着火时,应立即打开门窗,以降低室内温度进行灭火
【判断题】
调节系统动态特性试验的目的是测取电负荷时转速飞升曲线,以准确评价过渡过程的品质
【判断题】
禁止在油管道上进行焊接工作;在拆下的油管道上进行焊接时,必须事先将管道清洗干净
【判断题】
阀门的公称直径是一种名义计算直径,用Dg表示,单位为毫米(mm)。一般情况下,通道直径与公称直径是接近相等的
【判断题】
迷宫密封是利用转子与静子间的间隙进行节流、降压来起密封作用的
【判断题】
水泵中离心叶轮比诱导轮有高得多的抗汽蚀性能
【判断题】
按外力作用的性质不同,金属强度可分为抗拉强度和抗压强度、抗弯强度、抗扭强度等
【判断题】
油系统着火需紧急停机时,只允许使用润滑油泵进行停机操作
【判断题】
汽轮机在减负荷时,蒸汽温度低于金属温度,转子表面温度低于中心孔的温度,此时转子表面形成拉伸应力,中心孔形成压应力
【判断题】
汽轮机甩负荷试验,一般按甩额定负荷的1/3、1/2、3/4及全部负荷四个等级进行
【判断题】
为防止冷空气冷却转子,必须等真空到零,方可停用轴封蒸汽
【判断题】
金属在蠕变过程中,弹性变形不断增加,最终断裂
【判断题】
汽轮机热态启动和减负荷过程一般相对膨胀出现正值增大
【判断题】
汽轮机润滑油温过高,可能造成油膜破坏,严重时可能造成烧瓦事故,所以一定要保持润滑油温在规定范围内
【判断题】
滑参数停机时,为保证汽缸热应力在允许范围之内,要求金属温度下降速度不要超过1.5℃/min。在整个滑参数停机过程中,新蒸汽温度应该始终保持有50℃的过热度
【判断题】
一般辅助设备的试运时间应连续运行1~2h
【判断题】
发现汽轮机胀差变化大时,首先检查主蒸汽温度和压力,并检查汽缸膨胀和滑销系统,进行分析,采取措施
【判断题】
汽轮机的负荷摆动值与调速系统的迟缓率成正比,与调速系统的速度变动率成反比
【判断题】
汽轮机转动设备试运前,手盘转子检查时,设备内应无摩擦、卡涩等异常现象
【判断题】
汽轮机停机后的强制冷却介质采用蒸汽与空气
【判断题】
汽轮机超速试验时,为防止发生水冲击事故,必须加强对汽压、汽温的监视
【判断题】
大型汽轮机启动后应带低负荷运行一段时间后,方可做超速试验
【判断题】
为确保汽轮机的自动保护装置在运行中动作正确可靠,机组在启动前应进行模拟试验
【判断题】
汽轮机在冷态启动和加负荷过程中,蒸汽将热量传给金属部件,使之温度升高
【判断题】
在汽轮机膨胀或收缩过程中出现跳跃式增大或减小时,可能是滑销系统或台板滑动面有卡涩现象,应查明原因予以消除
【判断题】
汽轮机汽缸与转子以同一死点膨胀或收缩时出现的差值称相对膨胀差
【判断题】
汽轮机转子膨胀值小于汽缸膨胀值时,相对膨胀差为负值差胀
【判断题】
汽轮机冷态启动和加负荷过程一般相对膨胀出现向负值增大
【判断题】
汽轮机相对膨胀差为零说明汽缸和转子的膨胀为零