观测角度的仪器应满足哪些条件?

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问题:

观测角度的仪器应满足哪些条件?

考点:水利工程水利工程测量水利工程测量题库
题型:问答题 简答题

实验桌上有如下器材:满足实验要求的电源一个、电压表一只、开关一个、各种阻值已知的定值电阻和导线若干。小明想利用实验桌上的这些器材,设计一个实验证明:“串联电路中总电压等于各部分电压之和”。

(1)请根据上述要求帮助小明在实线框中画出实验电路图;

(2)写出主要实验操作步骤(只进行一组测量即可):

题型:问答题 简答题

淋病的主要传播途径是()

A.粪-口传播

B.血液传播

C.性行为传播

D.飞沫传播

E.虫媒传播

题型:问答题 简答题

试述制酸剂治疗溃疡病的作用及其注意点。

题型:问答题 简答题
短文填空:选择适当的词(组)并用适当形式完成短文。每个词(组)只使用一次,其中有两个词
(组)是多余的。
leak out,   likely,   keep,   undoubted,   though,   in short,   make use of,   never,   say ,   take,   still,   afford
     "You can learn English more efficiently if you spend 20 minutes a day for a week than if you spend two
hours a day." This is what a teacher usually 1______ when he tells his students how to allot (分配) their time.
But is it true?
     Suppose you have a bucket with a small hole in its bottom. Now you are asked to fill the bucket with the
water in a basin. If you are too little a boy to lift the basin full of water, you are sure 2______ a bowl or
something alike. You will dip out the water from the basin with the bowl and pour it into the bucket.You may
dip from the basin again and again. However, you will soon find that as soon as you pour a bowl of water into
the bucket, most of the water 3______ through the hole, so you are 4______ able to fill up the bucket this way. 
     On the contrary, if you are an adult, you will 5______ lift the basin and pour the whole basin of water into
the bucket at once. Now, the bucket is full. Though the water in it is also leaking out, you at least have filled up
the bucket with water. If you want to 6______ the bucket full, you only have to add a bowl of water now and
then.
     The same is true of English learning. Let us 7______ a simple example. If you learn 10 new words today,
you are most likely to remember 9 tomorrow. But if you try to learn 30 words today, though you may forget
far more than one word, you may 8______ be able to remember 11 or 12 words tomorrow.
     Day in and day out, you will be able to remember a large number of words, 9______ you may forget some
of them. 
     10______, the more time you spend at a time, the more you will learn on the whole. Of course, the amount
of time you spend each time must be within the limit that you do not exhaust (使筋疲力尽) yourself.
题型:问答题 简答题

阅读以下有关嵌入式系统设计的说明,在答题纸上回答问题1至问题3。

说明:

某公司承接了某机载嵌入式系统的研制任务。该机载嵌入式系统由数据处理模块、大容量模块、信号处理模块、数据交换模块和电源模块等组成。数据处理模块有2个,分别完成数据融合和导航通讯任务;大容量模块主要功能是存储系统数据,同时要记录信号处理模块、数据处理模块的自检测、维护数据,向数据处理模块提供地图数据;信号处理模块的处理器为专用的DSP,接收红外、雷达等前端传感器数据并进行处理,将处理后的有效数据(数据带宽较大)发送给数据处理模块;数据交换模块主要负责系统的数据交换:电源模块主要负责给其他模块供电,电源模块上没有软件。

要求该机载嵌入式系统符合综合化、模块化的设计思想,并考虑系统在生命周期中的可靠性和安全性,以及硬件的可扩展性和软件可升级性,还要求系统通讯延迟小,支持多模块上的应用任务同步。

为了实现满足ARINC653标准的操作系统的时空分区隔离机制,项目组选择了PowerPC作为数据处理模块的处理器(CPU)。这样,当一个分区出现故障时,不会蔓延到模块中同一处理器的其他分区。请用500字以内的文字,说明如何采用PowerPC实现应用与内核以及诸应用之间的隔离和保护。

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