自动闭塞应满足哪些技术条件?

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问题:

自动闭塞应满足哪些技术条件?

考点:铁路知识考试铁路知识考试综合练习铁路知识考试综合练习题库
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从社会发展的角度看,宋元时期民族融合的过程实质上是少数民族()

A.内迁杂居的过程

B.社会封建化的过程

C.汉族化的过程

D.经济农耕化的过程

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在测定一个未知电阻RX的阻值时,小明和小亮设计了如图甲所示的实验电路,其中R1是电阻箱,S1为单刀积掷开关。

(1)闭合开关S后,把开关S1接到触点1,调节滑动变阻器R,使电压表有个合适的示数U;把开关S1接到触点2后,小明和小亮采取了不同的实验操作。

小明的操作:保持滑片P的位置不变,只调节电阻箱R1,直到电压表示数为U;

小亮的操作:同时调节滑动变阻器R和电阻箱R1,直到电压表表示数为U。

你认为两人的操作中,_________的操作是正确的。

(2)选择正确的实验操作后,电阻箱R1上各旋钮的位置如图乙所示,其读数为______Ω,则待测电阻RX的阻值应为______Ω。

(3)下列实验中,所用方法与上述相同的是__________

A.探究二力的合成时,用台力来代替两个力的作用效果

B.探究摩擦力与接触面粗糙程度的关系时,保持压力一定

C.探究力与运动的关系时,推理出小车在不受力时的运动情况

D.探究液体内部的压强时,用U型管两侧液面的高度差来体现液体压强的大小

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One day not too long ago the employees of a large company in St .Louis, Missouri returned from their lunch break and were greeted with a sign on the front door. The sign said: “Yesterday the person who has been hindering(阻碍) your growth in this company passed away. We invite you to attend the funeral in the room that has been prepared in the gym.”

At first everyone was sorry to hear that one of their colleagues had died, but after a while they started getting curious about who this person might be. The excitement grew as the employees arrived at the gym to pay their last respects. Everyone wondered: “Who is this person that was hindering my progress? Well, at least he’s no longer here! ”One by one the employees got closer to the coffin (棺材) and when they looked inside it they suddenly became speechless. They stood over the coffin, shocked and in silence, as if someone had touched the deepest part of their soul. There was a mirror inside the coffin: everyone who looked inside it could see himself. There was also a sign next to the mirror that said: “There is only one person who is capable to set limits to your growth: it is you.”

You are the only person who can revolutionize your life. You are the only person who can influence your happiness, your realization and your success. You are the only person who can help yourself. Your life does not change when your boss changes, when your friends change, when your parents change, when your partner changes, when your company changes. Your life changes when you change, when you go beyond your limiting beliefs, when you realize that you are the only one responsible for your life.

小题1:The underlined word “funeral” in the first paragraph means ________.

A.an occasion when one admires himself in a mirror

B.a chimney from where smelly smoke comes out

C.a ceremony for burying or burning a dead person

D.an exhibition displaying varieties of treasures小题2:Which of the following would be the best title for the text?

A.Last Respects

B.A Strange Person

C.A Strange Company

D.A Road to Success小题3:Which of the following statements is TRUE according to the passage?

A.The employees were shocked when they saw the dead person.

B.It is you yourself that can actually change your life.

C.In the mirror you can find how small you are in the world.

D.You can achieve your goal if you set limits to your growth.小题4:It seems that the company is ________.

A.encouraging the employees to show respects to the dead

B.providing good working conditions for its employees

C.suffering a heavy loss due to its staff member’s death

D.trying to make its employees aware of their own potential

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中 * * 、国务院召开的西部大开发工作会议,对今后十年西部大开发的总体战略定位有明确的表述。西部大开发的战略定位是( )。

A.西部大开发在实现可持续发展中具有特殊地位
B.西部大开发在促进社会和谐中具有基础地位
C.西部大开发在深入贯彻科学发展观中具有特殊位置
D.西部大开发在我国区域协调发展总体战略中具有优先位置

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X线有物理特性、化学特性和生物特性,下面哪一项属于化学特性()

A.穿透作用

B.荧光作用

C.电离作用

D.干涉与衍射、反射与折射作用

E.感光作用

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