测量工作的两项基本原则是什么,应如何理解其意义和作用?

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问题:

测量工作的两项基本原则是什么,应如何理解其意义和作用?

考点:矿山测量工矿山测量工题库
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《水力发电厂计算机监控系统设计规范》规定:监控系统与电力调度数据网之间应配置()或纵向加密认证网关进行安全防护。

A.横向隔离装置;

B.防火墙;

C.纵向加密装置。

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跳台滑雪是一种极为壮观的运动,它是在依山势建造的跳台上进行的运动.运动员穿着专用滑雪板,不带雪杖在助滑路上获得较大速度后从跳台水平飞出,在空中飞行一段距离后着陆.如图所示,已知某运动员连带身上装备的总质量m=50kg,从倾角为θ=37°的坡顶A点以速度v0=20m/s沿水平方向飞出,到山坡上的B点着陆,山坡可以看成一个斜面(不计空气阻力,取g=10m/s2,sin37°=0.6,cos37°=0.8).求:

(1)运动员在空中飞行的时间t;

(2)AB间的距离s.

(3)运动员落到斜坡上的B点后顺势下蹲以缓冲使他垂直于斜坡的分速度在很短时间△t=0.2s的时间内减小到零.试求缓冲过程中滑雪板受到斜坡的平均支持力的大小.

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阅读下面的短文,然后按照要求写一篇150词左右的英语短文。

No doubt the planet is warming. Over the last century, the temperature has risen by around one degree Fahrenheit. It’s reported that the global temperatures will rise  by 3-10 degrees Fahrenheit—enough to have the polar caps almost melted. If the ice caps melt, buildings, homes and even lives will be under water.

While we know about global warming,  what can we do to save the planet? The answer is simpler than supposed. You don’t have to go miles away to protest, or spend much money. Here are several simple steps to begin with.

Firstly, plant a tree.Trees , when fully grown, will keep the plante cooler.

Secondly, reduce pollution. Sometimes as simple as walking instead of taking the car will reduce pollution. Besides stop pollution, you are giving yourself exercise. So whenever you get into your car, just ask yourself, “do I have to make this journey by vehicle?”

When you get a little cold in winter, put a jumper on and don’t adjust the heating. The extra heat produced by homes also affect the planet.

Finally, reduce, reuse and recycle. Only buy what you need and reuse whatever you can, like containers and paper, and recycle what you cannot reuse.

If everyone stuck to these rules, we would be doing a great thing by protecting the Earth. It is our next generation that will feel the effects.

[写作内容]

1. 以约30个词概括这段短文的内容 ;

2. 然后以约120个词就“阻止全球变暖从我做起”进行议论,内容包括:

(1)全球变暖危及人类生存;

(2)阻止全球变暖要从小事做起;

(3)你的做法。

[写作要求]

1. 在作文中可以使用自己亲身的经历或虚构的故事,也可以参照阅读材料的内容但不得直接引用原文中的句子;

2. 标题自定。

[评分标准]

概括准确,语言规范,内容合适,篇章连贯。

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Graves病甲亢甲状腺的特点是

A.症状越严重甲状腺越大
B.甲状腺质地较硬且有触痛
C.用碘剂可使甲状腺变软
D.甲状腺呈弥漫性对称性肿大
E.大多为结节性甲状腺肿

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汽轮机的滑销系统主要由()等滑销组成。

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