fasdf,脯氨酸的作用

asdfasdf 是什么

因为是标准指法中左手的四个键位

就是从左手小指到食指依次按一遍就是asdf

一般都是随意按出来的 没有特别的意思

经常看到可可醇巧克力，可是这个可可醇是什么？是添加剂么？ 请专业点的人士解答，混事的请绕道。

是可可黄烷醇吗?

可可黄烷醇是在植物性食物中发现的、具有潜在促进健康作用的化合物。

并不是所有巧克力中都含有可可黄烷醇。这是因为可可黄烷醇受可可豆的收获、加工、发酵，储存等诸多因素影响，并且巧克力中的可可黄烷醇在加热等众多复杂的加工过程中易被破坏。所以，可可黄烷醇的含量取决于生产工艺。白巧克力也没有可可黄烷醇。

请问英短和美短的体质哪个更好？

美短是美国短毛猫，他们的老祖宗当初是欧洲殖民者带到美洲大陆，和当地土猫结合而产生的，最早是为了捉老鼠的，因此体格较结实矫健，性格活泼好动，非常聪明贪玩，体质应该也更好。而英短就比较安静。

sfsadfasdfasdfasfasdf是什么意思？

这是练习键盘盲打的字序，盲打一般都是从 fasdf j;lkj 这个字序，先练习八个键位，接着是

frf juj fvf jmj 等等，以此类推，练习大量的字序组合直到完全熟悉键位，让手指记忆住键位而不是脑袋，以实现盲打。如果要摆脱一指禅打字法就得这么练，而这么练出盲打的人，如果在随意的输入乱码时，往往会下意识的打出fasdf这样的字序出来

A/D转换器外文翻译

Analog-To-Digital conversion

The first essential step in analog-to-digital(A/D) conversion is to sample an analog singnal. This step is performed by a sample and hold circuit, which samples at regular intervals called sampling intervals. The length of the sampling interval is the same as the sampling period,and the reciprocal of the sampling periodis the sampling frequency fs.According to the Nyquist theorem, a signal with a maximum frequency of W HZ(called a band-limited signal) must be sampled at least 2W samples per second to ensure accurate recording. When this minimum is not respected, distortion called aliasing occurs. Aliasing causes high frequency signals to appear as lower frequency signals. To be sure aliasing will not occur, sampling is always preceded by low pass filtering. The low pass filter, called the anti-aliasing filter, removes all frequencies above half the selected sampling rate.

After a brief acquisition time, during which a sample is acqured, the sample and hold circuit holds the sample steady for the remainder of the sampling interval. This hold time is needed to allow time for an A/D converter to gennerate a digital code that best corresponds to the analog sample.

The A/D converter chooses a quantization level for each analog sample. An N-bit converter chooses among 2N possible quantization levels. The larger the number of levels, the smaller the quantization errors, calculated as the difference between the quantized level and the true sample level. Most quantization errors are limited in size to half aquantization step Q. The quantization step size is calculated as Q=R/2N , where R is the full scale range of the analog signal and N is the number of bits used by the converter . The strength of the signal compared to that of the quantization errors is measured by dynamic range and signal-to-noise ratio .

A digital signal is represented by a set of vertical lines with circles at the top to mark the quantization levels selected for each sample . The bit rate for an A/D converter is the Nfs , where fs is the sampling rate .

Finally , each digital sample is assigned a digital code , which completes the A/D process . The result is a digital bit stream . It is this collection of digital codes that is processed in digital signal processing .

To summarize , A/D comprises anti-aliasing , sampling , quantization and digitisation.

ADCs come in almost as many flavors as ice creams , and at least as much care is needed in choosing the former as is required with the latter .

A popular and readily understood type of ADC is the Flash ADC . This is capable of very high-speed conversion and thus can accommodate high sampling rates , but in its basic form is very power hungry .

提问者：sujinbi - 试用期 一级

答复共 9 条

o

回答者：hebeaf - 试用期 一级 4-5 18:55

d

回答者：hebeag - 试用期 一级 4-5 19:09

always preceded by low pass filtering. The low pass filter, called the anti-aliasing filter, removes all frequencies above half the selected sampling rate.

After a brief acquisition time, during which a sample

回答者：狗狗爱猫猫N8变 - 初入江湖 二级 4-5 19:47

dfdzxf

回答者：ioip909 - 见习魔法师 二级 4-6 10:46

sample steady for the remainder of the sampling interval. This hold time is needed to allow time for an A/D converter to gennerate a digital code that best corresponds to the analog sample.

The A/D converter chooses a quantization level for each analog sample. An N-bit converter chooses among 2N possible quantization levels. The larger the number of levels, the smaller the quantization errors, calculated as the difference between the quantized level and the true sample level. Most quantization errors are limited in size to half aquantization step Q. The quantization step size is calculated as Q=R/2N , where R is the full scale range of the analog signal and N is the number of bits used by the converter . The strength of the signal compared to that of the quantization errors is measured by dynamic range and signal-to-noise ratio .

回答者：我叫苏玉龙 - 秀才 二级 4-7 10:17

123

回答者：我晕有人哈哈 - 助理 二级 4-7 17:31

asfsfdasdfasdfasdfadsfasdffgt

回答者：f0z - 兵卒 一级 4-7 21:32

这是向量问题的典型错误

(a*b)*c中a*b 是一个数量,由共线向量a=xb得知(a*b)*c表示平行于c 的向量,同理(b*c)*a表示平行于a 的向量,(a*b)*c与(b*c)*a模不一定相等故命题错误

sdfasdfasdf什么意思

键盘上最容易打的几个字母，没意义，一般用来灌水凑字数或瞎起名