转眼间，三年的初中生活也快画上一个句号。到了挥手说再见的时候，想起曾经与同学老师们相处的那些时光，你想给同学们留下一些什么话吗？

中学毕业留言

1、山不在高，有仙则灵，同窗多年，有你就行。回首往事，你总是在需要的时候出现，总是在困难的时候出现，总是在绝望的时候让我看到曙光，总是危难时刻显伸手，这一别不知何时相见，朋友珍重。

2、相遇相聚是情的开始，相分相离却不是情的结束，同窗几年的共同奋斗，凝聚着的无数美好瞬间，都被载入我们青春的纪念里。毕业了，朋友，祝你未来一切安好。

3、毕业，一种兴奋，走向新生活；毕业，一丝愁绪，友情话离别；毕业，一声珍重，来日聚会，祝你事业成功，生活幸福美满。

4、尽情地饮干这杯毕业之酒吧！它是生活的甘露！它将给未来注进胜利，它将长留在我们的唇间舌上，留下无尽的回味……

5、雪花乱飞的季节，我们也曾陷入迷茫的困惑，感到孤独和凄凉，但我们毕竟走了来。

6、我在白浪奔涌的大海边漫步，常为沙滩上拾贝壳的人们所吸引：那专注认真的神态，那悠悠自信的动作，仿佛整个大海是属于他的，所有的佳品可以任他选择。朋友，我禁不住想起了当年你在学业上的专注、认真、自信……

7、毕业了，多么想留住那些温暖的日子，但又多么渴望着能早日投进生活的洪流。那以往的同窗生活，是一串甜美的糖葫芦；那迷人的甜与酸，将永远回味不完。

8、母校，我们三年成长的地方。这里有我们太多的回忆，太多的欢声笑语。我衷心地希望母校能越办越好，能培养出更多的栋梁之才。

9、在学校这三年中，我们感受到了温暖，得到了学校给我们的爱。我祝愿学校，能够越办越好，也能够给我们的后辈带来更好的生活。

在外部设备中扫描仪属于什么

在外部设备中扫描仪属于输入设备。是计算机与用户或其他设备通信的桥梁。输入设备是用户和计算机系统之间进行信息交换的主要装置之一。键盘，鼠标，摄像头，扫描仪，光笔，手写输入板，游戏杆，语音输入装置等都属于输入设备。

10、每当我看见一花一草，我都会想起母校；每当我看见楼房建筑，我都会想到母校；每当我看见池塘小鱼，我都会想起母校。我爱你，母校!

中学毕业简短的英文留言

1.The mountain is not high, there are fairies, students for many years, you can do. Looking back, you always show up when you need to, when you are in trouble, when you are in despair, when you let me see the dawn, when you are in danger, you always show your hand. Don't know when to meet each other, my friends cherish it.

2.Meeting and gathering is the beginning of love, but parting is not the end of love. The joint efforts of students for several years and countless beautiful moments are all recorded in the memory of our youth. Graduation, friend, wish you all the best in the future.

3.Graduation, a kind of excitement, towards a new life; graduation, a trace of melancholy, farewell friendship; graduation, a treasure, party in the future, I wish you success in your career, happy life.

4.Drink up this graduation bar! It is the dew of life! It will inject victory into the future, it will stay on our lips and tongue, leaving endless aftertaste

5.In the snowy season, we were confused and lonely, but we came after all.

6.When I walk on the white sea, I am often attracted by the people who collect shells on the beach: the attentive and serious manner, the long and confident action, as if the whole sea belongs to him, and all the best products can be chosen by him. Friend, I can't help thinking of your concentration, seriousness and self-confidence in your studies

7.After graduation, how I want to keep those warm days, but how I long to be able to enter the flood of life as soon as possible. That past classmate life, is a string of sweet candied haws; that charming sweet and sour, will never finish aftertaste.

8.Alma mater, where we grew up in three years. There are too many memories, too many laughter. I sincerely hope that my alma mater can do better and cultivate more talents.

9.In the three years of school, we feel the warmth and get the love from the school. I wish the school can do better and better, and also can bring better life to our later generations.

10.Every time I see a flower and a grass, I think of my alma mater; every time I see a building, I think of my alma mater; every time I see a pond fish, I think of my alma mater. I love you, alma mater!

点的投影规律是什么

点的投影规律是投影连线垂直于投影轴；投影与投影轴的距离，反映该点的坐标，也就是该点与相应的投影面的距离；点动成线，线动成面，点的投影是直线投影和平面投影的基础。