数字时代的通信问题英语作文【一】
RTL8019AS 网络接口芯片是台湾 Realtek 公司的代表性产品之一，该芯片基于 ISA 总线结构，性能稳定且价格低廉，在工业企业领域有非常广泛的应用[ 1 ]。
1.1 RTL8019AS接口芯片的主要特性
RTL8019AS芯片主要优点有：
一是支持热插拔(即插即用的动态检测;
二是完全兼容当前主流的NE2000 模式并可在8 位与 16 位两种模式下工作;
三是有跳线与非跳线两种模式可供选择;
四是支持全双工通信模式，双工通信时信道的传输速率可达到10Mbps;
五是内置数据预取功能;
六是内置 16K 字节的闪存;
七是支持 8/16两种前端总线工作模式，内置8 个中断申请线，同时有16 个I/O地址可供选择。
1.2 51单片机与RTL8019AS连接实现网络通信的电路设计
1.2.1 RTL8019AS 与 93C46 接口电路
93C46接口电路内部存储容量为1Kbits，是四线串行接口EEPROM。RTL 8019 AS芯片在上电或者初始化复位时，首先要从该芯片中读取预设的配置信息才能完成初始化。 93C46 内部存储器的前三个地址空间用于存放 RTL8019AS芯片的上电初始化信息;后5个地址空间用于记录本机地址;0AH-11H 的地址空间分配给制造商存储产品的信息;
12H～7FH 的地址空间用于记录即插即用信息。RTL 8019 AS 的EECS引脚连接93C46的CS引脚，EESK引脚连接SK引脚，EEDI引脚连接DI，EEDO引脚连接DO引脚，即由EECS 提供片选信号，EESK 提供时钟信号，EEDI 与 EEDO 定义为串行数据I/O通道。
1.2.2 RTL8019AS 与 SST89E564RD 接口电路的.硬件连接
SST 系列单片机是美国 SST公司生产的一种中高端51系列单片机，SST89 E564RD 单片机是其SST系列单片机中的一个型号。将RTL8019AS 的SD0-SD7 引脚与SST89E564RD 的P0.0-P0.7引脚相连，相连后的引脚通过锁存器与A0-A7引脚相接，同时将74HC573的A0-A5引脚与 RTL 8019AS 的SA0-SA5引脚相接，将SST89E564RD的P0口用作D/A端口。
此外，SST89E564RD的 P2.0-P2.6 引脚与 静态存储芯片TMS62256 的高7位地址线引脚相接，组合成访问 TMS的15位地址总线。将SST 89E564 RD的SMEMRB 引脚接+5V，同时将IOCHDRY引脚悬空，JP 引脚为跳线模式，IOCS 16B引脚接地，使 RTL8019AS 工作在 8 位模式[ 2 ]。
1.3 网络接口电路的地址定义
RTL8019AS中 SA0-SA19 的连接方式如下：SA5-SA7以及SA10-SA19 接 GND，SA8-SA9 接+5V电压，SA0-SA4 接74HC573的A0-A5引脚。SST 单片机可以通过 P0.0-P0.4来选中RTL8019AS 的 32 个I/O端口并相应地对其进行R / W操作。此外，将RTL8019AS 的IORB 和 IOWB 引脚分别与SST89E564RD单片机的 RD 和 WR 相连作为R/W选通信号。
然后在 93C46 接口电路的低位00H 单元中写入 00H，将IOS0-IOS3 赋值为 0，这样就可将RTL8019AS 选择 I/O 端口的基本寻址地址定义为 300H，地 址 空 间 就为 00300H-0031FH。
数字时代的通信问题英语作文【二】
我认为课前预习是非常好的一种学习方法，通过预习可以使好学生在学习时更有自信，不好的学生先预习如果不懂经过第二天老师的点拨会豁然开朗。所以本节课我让学生在课前自己预习了本节课的内容。在教学改写成用万作单位的时候教学效果非常好。我以身体里流淌着很多液，在液里有很多的白细胞和红细胞，你知道白细胞和红细胞的作用吗?学生由于课前已经预习所以说的非常好。然后我又问你知道一小滴液里含有多少红细胞和白细胞吗?学生马上就说出了红细胞和白细胞的个数，我自然而然引出万以内数的改写。
数字时代的通信问题英语作文【三】
st On January 2016, our country started to carry out two-child policy. It is good
and right for the development of our country now, because our country need more young workers. Many parents also want to have one more child. Althouth they may have some difficulties in affording another child’s life, education and so on, they will have another child to be with them. As for me, the only child in my family, I want to have a sister or a brother. Not only can we share happiness, but also we can help each other in our daily life.
2016年1月,我国开始实施的二胎政策。它是好的
现在对我们国家的发展,因为我们的国家需要更多的年轻工人。许多家长也想要一个孩子。虽然他们可能有困难提供另一个孩子的生活,教育等等,他们会有另一个孩子。至于我,我家里唯一的孩子,我想有一个姐姐或者哥哥。不仅我们能分享快乐,而且在我们的日常生活中我们可以互相帮助。
：
1.二胎英文看图作文
2.二胎英语看图作文
3.大学二胎英文看图作文
数字时代的通信问题英语作文【四】
中国是一个人口大国。为了解决人口问题，我国政府决定实施独生子女政策。执行一段时间后，许多人不仅看到了这个政策的优点还有缺点。因此，人们开始推崇二胎政策。在我看来，二胎政策是应该实施的。作文
First of all, two-child policy is the gift for some only child. For some families, maybe the parents are only child and they also can have only child. Put aside the loneliness of their child, when their child grows up and they grow older, their child marry with an only child girl accidentally, the burden on their child and his wife is unimaginable heavy. Their child and his wife have to take care of two old couples. Usually, a young couple looking after an old couple is a little difficult; if the pressure increasing twice, how can they stand it. But if their parents have two children, they can share the burden of taking care of their parents. It would be much better.
首先，二胎政策对于一些独生子女来说是天赐的礼物。对于一些家庭来说，也许父母都是独生子女，而他们也只生一个孩子。抛开孩子的孤独不说，当他们的孩子长大了，而他们也变老了，他们的孩子又和一个独生子女结婚，这样的话,压在他们孩子和孩子妻子肩上的压力是不可想象的。他们的孩子和他的妻子不得不照顾两对老人。通常，一对年轻的夫妇照顾一对老人就有点难了;如果压力增加了一倍，他们怎么能忍受呢。但是如果他们的.父母有两个孩子，他们就能分享照顾父母的压力。这样会比较好。
Secondly, two-child policy can guarantee the number of Chinese population. As the widely spread of one-child policy, some people have changed their conception about giving birth. If they firmly believe one-child policy, there will be more and more the dink. After several decades, our country will famous for lack of population.
其次，二胎政策可以确保中国的人口数量。由于广泛宣传独生子女政策，有些人已经改变了他们的生育观念。如果他们认同独生子女政策，就会有越老越多的丁克族。几十年后，我国就会以人口短缺而著名了。
In conclusion, one-child policy has out of date. And tow-child policy is needed and necessary. It can solve the problem of nowadays and the future.
总之，独生子女政策已经过时了。二胎政策是必要和必须的。这可以解决当前和未来的问题。
数字时代的通信问题英语作文【五】
1.看，这些大数含有三级，你会读吗？这些数有什么特点？你能将它们改写成用“亿”作单位的数吗？对于学生举得例子中整亿的数，老师放手让他们自己改写（比较简单），改写后，说一说怎样改写的，应注意什么？
2.不是整亿的数省略亿后面的尾数求近似数，老师也是给学生充足的空间时间，自己尝试做一做。汇报交流时，重点强调，省略亿位后面的尾数关键要看哪一位上的数是否满五？
总之，学生自己能学会的知识，老师绝不包办代替，给学生留有空间，鼓励他们大胆尝试，利用已有的知识和学习方法自主探索，解决新的问题，提高数学能力。
数字时代的通信问题英语作文【六】
China is a great country with the largest population in the world. In order to solve the population problem, our government decides to implemented one-child policy. When it is carried out for some time, many people not only see its advantages but also disadvantages. Thus, people argue that two-child policy should be put into effect. In my opinion, two-child policy should be carried out.
中国是一个人口大国。为了解决人口问题，我国政府决定实施独生子女政策。执行一段时间后，许多人不仅看到了这个政策的优点还有缺点。因此，人们开始推崇二胎政策。在我看来，二胎政策是应该实施的。作文
First of all, two-child policy is the gift for some only child. For some families, maybe the parents are only child and they also can have only child. Put aside the loneliness of their child, when their child grows up and they grow older, their child marry with an only child girl accidentally, the burden on their child and his wife is unimaginable heavy. Their child and his wife have to take care of two old couples. Usually, a young couple looking after an old couple is a little difficult; if the pressure increasing twice, how can they stand it. But if their parents have two children, they can share the burden of taking care of their parents. It would be much better.
首先，二胎政策对于一些独生子女来说是天赐的礼物。对于一些家庭来说，也许父母都是独生子女，而他们也只生一个孩子。抛开孩子的孤独不说，当他们的孩子长大了，而他们也变老了，他们的孩子又和一个独生子女结婚，这样的话,压在他们孩子和孩子妻子肩上的压力是不可想象的。他们的孩子和他的妻子不得不照顾两对老人。通常，一对年轻的夫妇照顾一对老人就有点难了;如果压力增加了一倍，他们怎么能忍受呢。但是如果他们的父母有两个孩子，他们就能分享照顾父母的压力。这样会比较好。
Secondly, two-child policy can guarantee the number of Chinese population. As the widely spread of one-child policy, some people have changed their conception about giving birth. If they firmly believe one-child policy, there will be more and more the dink. After several decades, our country will famous for lack of population.
其次，二胎政策可以确保中国的人口数量。由于广泛宣传独生子女政策，有些人已经改变了他们的生育观念。如果他们认同独生子女政策，就会有越老越多的丁克族。几十年后，我国就会以人口短缺而著名了。
In conclusion, one-child policy has out of date. And tow-child policy is needed and necessary. It can solve the problem of nowadays and the future.
总之，独生子女政策已经过时了。二胎政策是必要和必须的。这可以解决当前和未来的问题。
数字时代的通信问题英语作文【七】
Emerging from the cartoon is an eye-catching scene that the parents are willing to have a second child, while their only child do not agree because of his worry that he doesn't want to have another child, even his own sibling, share toys with him. Simple as it is, the symbolic meaning revealed is profound and thought-provoking.
We are supposed to place our attention on, instead of its funny appearance, the implied meaning of the cartoon: as the overall second-child policy expands throughout China, some only children are so selfish that they cannot accept the second child in their family. What can account for this undesirable situation? For one thing, they, as the only child at home all the time, have no awareness of sharing what they like with others due to the fact that all the family members give their love to the only child. As a result, when faced with the problem of whether they are willing to have a sibling, their first response is to refuse it. For another reason, some couples are eager to have a second child as soon as possible, which makes them neglect to communicate with their only child to let them realize the advantage of having a sibling companion in their childhood.
From what has been discussed above, it's safe for me to conclude that it is urgent to take some immediate and effective measures. What I recommend is that parents should let child know the importance of sharing with others, which is beneficial for them in future life. In addition, it's better for parents to have more communication with their only child once they want to have a second child.
数字时代的通信问题英语作文【八】
什么叫通信卫星呢?
通信卫星又称同步卫星。它的特点是运转方向和绕地球一周的时间都与地球自转方向和时间相同。从地面上看去，它像和地球赛跑的运动员，速度与地球的自转“旗鼓相当”。其实，它在远离地球的轨道上运行，速度比起地球的自转速度来可快多了。
通信卫星的“年龄”并不大。但是，从20世纪60年代至今已更新换代3次了，现在正以越来越快的速度向前飞速发展。目前，许多国家都在进行通信卫星的研究，我国已于今年成功地发射了试验性通信卫星。这标志着我国科学技术的又一大进步。
1984年的暑假里，在美国洛杉矶举行了举世瞩目的第二十三届奥运会。在比赛的那几天，我们每天都能在电视中看到当天比赛的情况。是谁把比赛的实况从远在大洋彼岸的洛杉矶传到这儿来的呢?这就是通信卫星的功劳。通信卫星的作用大得很。它不仅能使人们及时看到世界各地发生的重大事件，还能让各国人民通过电话互相增进了解。过去，电话通讯是靠电话线，而电视信号的传播则必须通过徽波中继站进行。这在不大的范围内还行得通，如果要翻山过海，就不得不花费巨大的人力、物力。通信卫星的诞生，像是给人们长上了“千里眼”、“顺风耳”，使这种状况有了很大的.改观。
一颗先进的通信卫星，可以通两路彩色电视，上百万路的电话；它的工程范围也很大。只要有了通信卫星，按一定距离运行在赤道上空的轨道上，就可以形成一个统一的全球通讯网，真可谓神通广大。
卫星为什么能够进人太空呢?那是因为有运载火箭给与了它们一定的高度和速度。通信卫星对运行轨道有严格的要求。火箭只有将卫星送人离地面约35 800公里的同步轨道内，通信卫星才能“老老实实”地呆在地球某一地区的上空。由此可见，通信卫星的发射也是一门很复杂的科学技术。
通信卫星的前景是十分广阔的。不久的将来，通信事业将更加发达。那时，通信卫星的技术也自然会逐步提高。它将可以通五六路彩色电视，上千万路电话。不仅如此，通信卫星还将应用到其他各个领域，如搜寻失踪飞机、船只等等。总之，通信卫星——这个卫星家族中的一员，将显示出越来越大的神通，为各国人民作出更大的贡献。
