求大神来解答下面的问题1．An audio signalis sampled 8000 times per second. Each sample is represented by 256 differentlevels. How many bits are needed to represent this signal?A.8000 B. 256*8000 C.7*8000 D. 8*80002．An imaginarycomputer h_百度作业帮
求大神来解答下面的问题1．An audio signalis sampled 8000 times per second. Each sample is represented by 256 differentlevels. How many bits are needed to represent this signal?A.8000 B. 256*8000 C.7*8000 D. 8*80002．An imaginarycomputer h
求大神来解答下面的问题1．An audio signalis sampled 8000 times per second. Each sample is represented by 256 differentlevels. How many bits are needed to represent this signal?A.8000 B. 256*8000 C.7*8000 D. 8*80002．An imaginarycomputer has four data registers (R0 to R3), 1024 words in memory, and 16different instructions (add, subtract, etc.). What is the minimum size of an instructionin bits if a typical instruction uses the following format: add 565 R2.A.12 B. 16 C.15 D. 143．Given the binary number
, which one of the following is thecorresponding decimal number?A.20 B. 34 C.68 D. 364．Show the following number in 32-bit IEEE format:+2-4*1.A.0,B.0,C.1,D.1,100115．A computer has 64MB of memory. Each word is 4 bytes. How many bitsare needed to address each single word in memory?A.24 B. 23 C.13 D. 146．A gray scale picture is digitized using four different gray levels.If the picture is composed of 100*100 pixels, how many bits are needed torepresent the picture?A.30000 B. 80000 C.40000 D. 200007．If the memory address space is 8MB and the word size is 8 bits, then
bits are needed to access each word.A.24 B. 10 C.8 D. 238．Which one of the following statements is TRUE?A.When using floating-point notation, we usually use a bit to store the radixpoint.B.When representing very small fractions, the problem of overflow may occur.C.All decimal numbers can be represented exactly using binary notation.D.When two’s complement notation is used to represent numeric values, a circuitfor addition combined with a circuit for negating a value is sufficient forsolving both addition and subtraction problems.9．Show the result of the following operation:(x99 AND x33) OR (x00 AND xFF)A.x33 B. x11 C.x00 D. xFF10．In the following, which one represents the largest capacity?A.1024KB B. 100GB C.1TB D. 1024MB
DBBXADBDBC 第4题题目那个数字没看明白,没见过这样的表示法.
那是2的-4次幂
能不能简单解释一下这几道题，谢谢啦
第1题：对某个音频信号每秒采样8000次，每次采样后的量化值可表述为256级不同的电平，问这个信号每秒钟需要多少位表述。
256级不同的电平需要8个位才能表示（256等于2的8次方），因此每秒需要8*8000个位。
第2题：假设某个计算机有4个寄存器（R0~R3），内部存储器包含1024个字，然后支持16种不同的操作（加、减、等等）。假定一条完整的指令类似于add 565 R2，那么该计算机的指令系统至少为多少位？
从列举的指令格式可以看出操作、内部存储器地址、寄存器一个都不能少。4个寄存器需要2位，1024个字需要10位，16种操作需要4位，因此总共至少需要16位。
第3题：二进制数对应的十进制数。
这题太基础，没什么好讲的。
第4题：如果是2的-4次幂，再乘以1.，那么按照IEEE754标准，则符号位为0，8位阶码为位小数部分为后面全是0。因此选A。
第5题：某计算机有64MB内存。该计算机的一个字是4字节，那么对单个字寻址需要多少位？
64MB÷4 = 16MB，因此字地址是24位。
第6题：某灰度图片可量化为4个灰度级别，且该图片分辨率为100*100，那么该图片占用多少位？
4个灰度级别需要2位，因此2*100*100 = 20000
第7题：假设内存地址空间为8MB，每个字为8位，那么对单个字寻址需要多少位？
每个字恰好是一字节，因此字寻址范围是8M，需要23位。
第8题：下面哪个表述是正确的？
A，表述浮点数的时候通常用一个位来表述小数点。
这是错误的。IEEE格式浮点数是固定格式解析，不需要用某个位表述小数点。
B，表述极小分数时，容易发生溢出。
这是错误的。既然是极小，那么容易发生下溢或者截取，而不是溢出。
C，所有十进制数都可以用二进制数精确表示。
这是错误的。对于整数，可行；对于小数，大部分十进制数是无法用二进制数精确表示的。
D，用2的补码形式表示数字时，一个加法电路加上一个反相电路便可解决加减法运算。
这是正确的。
第9题：(x99 AND x33) OR (x00 AND xFF)
x99 AND x33 = x11
x00 AND xFF = x00
x11 OR x00 = x11
第10题：下列哪一个代表最大的（数据）容量？
常识题，没啥好解释的。您的举报已经提交成功，我们将尽快处理，谢谢！
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1.who is expected to eat first in your country2.you should not point at others with your fingers3.how does he feel about meeting strangers4.the girls about your age are really beautiful 5. sally doesn't hate noodles as she used to
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太给力了，你的回答完美地解决了我的问题，非常感谢！
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who is expected to eat first in your country
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David works in a car factory in a big town .He likes fishing very much and is very good at it .When he has time ,he goes down to the small river behind the car factory and wants to catch some fish ,but there are very few because the water is not clean for fish to live in.Now David’s holidays come. He goes to the sea for fishing and stays at a small cheap hotel. It is the first time to fish in the sea. He thinks.On the first day, He catches about three kilos of fish. He is very happy to give the fish to the hotel. And the hotel cooks the fish for the guests. They all like the fish and the hotel likes very much .The same thing goes on for seven days. But when David gets his bill, he finds that he has to give the hotel $3.50 for cooking the fish.( ) 6.The passage mainly tells about______.A. going to the sea for fishingB. David’s holidaysC. Seven day’s stay at a small cheap hotelD. Fishing and cooking the fish( ) 7.What’s David?A. He’s a factory workerB. He works in a hotelC. He’s a car driverD. He catches fish.( ) 8.David goes to the sea ________.A. to cook fishB. to catch some fish for a livingC. to have his holidaysD. to help the hotel( ) 9.How many kilos of fish does David catch in the sea?A. About 3.B. About 21C. About 35D. About 24.5( ) 10.From the text we know that ______.A. David has a lot of money and is very kind.B. The sea is not near his factory and it is a very good place for holidays.C. David had to give three and a half dollars for the fishing.D. It takes David $3.5 to cook the fish.
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6.B（Now David’s holidays come）第二段第句概括7.A（David works in a car factory in a big town ）第段第句汽车工厂工作8.C(Now David’s holidays come. )说明要度假其<img class="word-replace" src="/api/getdecpic?picenc=0ad616c选项太片面D答案压根错、9.A（about three kilos of fish.）明显第三段10.D（he has to give the hotel $3.50 for cooking the fish.）句虽我神菜
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(1)甲图书其书半所整图书总数1/3乙图书其书1/3所整图书总数1/4丙图书其书1/4所整图书总数1/5丁占图书总数：1-1/3-1/4-1/5=13/60图书总数：91÷13/60=420本（2）菜半麦1/313平米乘2则菜总面积麦面积2/326平米同麦总面积菜面积2/324平米见麦面积1/3比菜面积1/3少2平米麦面积比菜面积少6平米菜总面积与麦面积2/3比菜总面积与菜面积2/3少4平米即菜面积1+2/3：26+4=30平米所菜面积：30÷（1+2/3）=18平米麦面积18-6=12平米
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