溢流阀在液压系统中有何功能_爱下问搜题

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问题问答题

溢流阀在液压系统中有何功能

答案

参考答案：

解析：溢流阀的功能是溢出液压系统中的多余液压油(流回油箱)，并使液压系统中的油液保持一定的压力，以满足液压传动的工作需要。此外，还可以用来防止系统过载，起安全保护作用。

问答题

如图所示，在平面直角坐标系XOY内，第I象限存在沿Y轴正方向的匀强电场，第IV象限内存在垂直于坐标平面向里的匀强磁场，磁感应强度大小设为B₁（未知），第III象限内也存在垂直于坐标平面向里的匀强磁场B₂（未知）．一质量为m的电子（电量为e，不计重力），从Y轴正半轴上Y=h处的M点，以速度v₀垂直于Y轴射入电场，经X轴上X=

h处的P点进入第IV象限磁场，然后从Y轴上Q点进入第III象限磁场，OQ=OP，最后从O点又进入电场．

（1）求匀强电场的场强大小E；

（2）求粒子经过Q点时速度大小和方向；

（3）求B₁与B₂之比为多少．

完形填空

One day I decided to quit．I quitted my job, my relationship, my spirituality. I wanted to quit my life.
I went to the     to have one last talk with God． "Can you give me one good    not to quit?" His answer surprised me．
"Look around． Do you see the fern（蕨类植物） and the bamboo? When I planted their seeds, I took good care of them．The fern quickly grew from the earth．     nothing came from the bamboo seed． During the following three years, the fern grew more plentiful． And    , nothing came from the bamboo seed． But I did not quit on the bamboo． Then in the fifth year a      sprout（新芽） emerged from the earth． Compared to the fern it was     small and insignificant． But just 6 months later the bamboo     to over 100 feet tall． It had spent the five years growing    ． Those roots made it strong and gave it     it needed to survive．I wouldn’t give any of my creations a challenge it could not    ．”
He said to me .”All this time you have been struggling , you have ___been growing roots . I would not quit on the bamboo.____will I ever quit on you .Don’t ____yourself with others .The bamboo had a different ____from the fern .Yet they both make the forest beautiful .Your time will ___ .You will rise high!”
"How high should I rise?" I asked．
"How high will the bamboo rise?" He asked     ．
"As high as it can?" I    ．
"Yes," He said． "Give me glory     rising as high as you can．"
I left the forest and bring back this story． I hope it can help you see that God will never    on you． Never regret a day in your life． Good days give you happiness． Bad days give you   ． Both are necessary to life．

D．explanation

A．particularly

B．recognition

D．possibility

B．in exchange

A．experiences