【判断题】
X62W型铣床电气线路的控制电路由控制变压器TC、熔断器FU1、按钮SB1~SB6、位置开关SQ1~SQ7、速度继电器KS、电动机M1~M3等组成
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相关试题
【判断题】
X68W型铣床的主轴电动机M1采用了减压启动方法
【判断题】
X62W型铣床主轴电动机M1的冲动控制是由位置开关SQ7接通反转接触器KM2一下
【判断题】
X62W型铣床的回转控制只能用于圆工作台的场合
【判断题】
X62W型铣床的回转控制可以用于普通工作台
【判断题】
X62W型铣床的照明灯由控制照明变压器TC提供24V的安全电压
【判断题】
X62W型铣床的照明灯由控制照明变压器TC提供10V的安全电压
【判断题】
T68型管床电气控制主电路由电源开关QS、熔断器FU1和FU2、接触器KMl~KM7、热继电器kH、电动机Ml和M2等组成
【判断题】
T68型镗床电气控制主电路由电源开关QS、熔断器FU1和FU2、接触器KM1~KM7、行程开关SQ1-S08、中间继电器KA1-KA2、速度继电器KS，时间继电器KT等组成
【判断题】
T68型镗床电气线路控制电路由控制变压器TC、按钮SB1-SB5、行程开关S01~S08、中间继电器KAl和KA2、制动电阻R、电动机Ml和M2等组成
【判断题】
T68型像床的主轴电动机采用全压启动方法
【判断题】
T68型镗床的主轴电动机采用减压启动方法
【判断题】
T68型镗床的主轴电动机采用了变频调速方法
【判断题】
T68型傻床的主轴电动机采用了△-YY变极调速方法
【判断题】
T68型镗床的主轴电动机采用了电源两相反接制动方法
【判断题】
T68型镗床的照明灯由控制照明变压器TC提供10V的安全电压
【判断题】
T68型镗床的速度继电器KS安装调整不当会使主轴转速比铭牌多一倍我少一倍
【判断题】
集成运放电路线性应用必须加适当的负反馈
【判断题】
集成运放电路非线性应用要求开环或加正反馈
【判断题】
组合逻辑电路的典型应用有译码器及编码器
【判断题】
时序逻辑电路的输出不仅与输入有关，还与原来状态有关
【判断题】
电子电路常用protel绘图软件进行绘制
【判断题】
集成移位寄存器可实现顺序脉冲产生器功能
【判断题】
74LS138及相应门电路可实现加法器的功能
【判断题】
集成二一十进制计数器通过反馈置数及反馈清零法计数
【判断题】
集成二一十进制计数器可通过显示译码器将计数结果显示出来
【判断题】
集成二一十进制计数器可以组成任意进制计数器
【判断题】
集成运放电路的电源极性如果接反，会损坏运放元件
【判断题】
集成运放电路的两输入端可外接反向并联的二极管，防止输入信号过大，损坏元件
【判断题】
组合逻辑电路不能工作时，首先应检查其使能端的状态对不对
【判断题】
组合逻辑电路的使能端状态不对时，组合元件不能工作
【判断题】
CMOS门电路输入端不能悬空，否则容易击穿损坏
【判断题】
三态门的使能端状态不对时，信号传输将断开
【判断题】
数码寄存器的结果出现错误，可能是没有清零端操作
【判断题】
RS触发器具有两种稳定状态，并具有不定状态情况
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【单选题】
Many frogs ___ the sound of their voice using special sacs(囊) in their throat.
A. amplify
B. widen
C. expand
D. enlarge
【单选题】
Some old people don’t like pop songs because they cannot ___ so much noise.
A. resist
B. sustain
C. tolerate
D. undergo
【单选题】
I have kept that portrait where I can see it every day, as it always ___ me of my university days in London.
A. recollects
B. reminds
C. recalls
D. invokes
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The article suggests that when a person is under unusual ___ he should be especially careful to have a well-balanced diet.
A. weight
B. stress
C. press
D. nerve
【单选题】
You should hire a more ___ manager than the one you currently have.
A. sufficient
B. effective
C. respective
D. efficient
【单选题】
Surgeons began to ___ their hands and arms with soap and water before operating.
A. scrub
B. enhance
C. rub
D. exhibit
【单选题】
He might let something ___ in a moment of weakness.
A. slip
B. leak
C. to slip
D. to leak
【单选题】
Do not ___ the salad until you are ready to serve.
A. mix
B. toss
C. fling
D. eat
【单选题】
The ___ for which he had fought all his life no longer seemed important to him.
A. aims
B. objectives
C. subjects
D. goals
【单选题】
You should pause and ___ now.
A. tweet
B. ponder
C. squander
D. gossip
【单选题】
Eating too much fat can ____heart disease and cause high blood pressure.
A. contribute to
B. attribute to
C. attest to
D. devote to
【单选题】
It soon ___ that what she loved was not my person but my wealth.
A. widened
B. expanded
C. extended
D. developed
【单选题】
I want to buy a new tie to ___ this brown suit.
A. go into
B. go after
C. go with
D. go through
【单选题】
Our company decided to ___ the contract because a number of the conditions in it had not been met.
A. destroy
B. resist
C. assume
D. cancel
【单选题】
My first ___ was to turn and run.
A. institute
B. institution
C. instinct
D. tuition
【单选题】
I think it’s time I ___ in a new computer.
A. invested
B. insulted
C. interacted
D. impacted
【单选题】
The jeweler will ____ the inside of the ring with her name.
A. carve
B. engrave
C. cut
D. engross
【单选题】
He was bleeding from a _____ on his forehead.
A. lash
B. gash
C. ash
D. sash
【单选题】
Let us go to the next ______ on the agenda.
A. matter
B. debate
C. speech
D. item
【单选题】
They are _____ moving their office outside London.
A. considered
B. discussing
C. pondering
D. negotiating
【单选题】
Although she _____ the old pot thoroughly, she could not make it look completely clean.
A. scrubbed
B. washed
C. made
D. screwed
【单选题】
The mistake will remain an indelible ____ on his memory.
A. stain
B. thing
C. issue
D. accident
【单选题】
The wheel ____ through my frozen hand, and the car went right across the road.
A. slipped
B. sipped
C. dashed
D. disappeared
【单选题】
The cupboard was ____ with old fishing tackle.
A. stuffed
B. stocked
C. stored
D. filled
【单选题】
The decision depended on the ____ of a coin.
A. loss
B. lot
C. toss
D. sign
【单选题】
Teaching can be a tiring and ____ job.
A. meaningless
B. stressed
C. rewarded
D. stressful
【单选题】
The building is partly a museum and partly a private ____.
A. place
B. area
C. community
D. residence
【单选题】
Stop ______ your foot.
A. tossing
B. wiggling
C. exhibiting
D. reviewing
【单选题】
It was a bloody ___ between the two armies.
A. rebellion
B. encounter
C. meet
D. fight
【单选题】
They conferred on the best way to ______ business.
A. extend
B. adjust
C. expand
D. adopt
【单选题】
We had a party last month, and it was a lot of fun, so let’s have ____ one this month.
A. another
B. the other B. more D. other
【单选题】
I decided to go to the library as soon as I ____.
A. finish what I did
B. finished what I did
C. would finish what I was doing
D. finished what I was doing
【单选题】
The speaker, ______ for her splendid speeches, was warmly received by the audience.
A. having known
B. being known
C. knowing
D. known
【单选题】
No sooner had we reached the top of the hill ______ we all sat down to rest.
A. when
B. then
C. than
D. until
【单选题】
___ energy under the earth must be released in one form or another, for example, an earthquake.
A. Accumulated
B. Gathered
C. Assembled
D. Collected
【单选题】
Please ___ me for my rudeness. I really do not know the custom here.
A. engaged
B. comfort
C. execute
D. forgive
【单选题】
Sometimes it is very difficult to ___ some of the English words. Even the native speaker cannot help.
A. decrease
B. create
C. define
D. delight
【单选题】
In the wife’s eyes, his ___ to their marriage life is far from perfect.
A. requirement
B. commitment
C. participation
D. reflection
【单选题】
This newspaper often ___ the government’s opinion, not the public opinion.
A. affects
B. reacts
C. reflects
D. recognizes
【单选题】
It is predicted that heavy rains are ___ to flood the area in a few days.
A. frightening
B. threatening
C. scattering
D. warning
