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[主观题]

Cones is mainly located at

A、optic disk

B、peripheral of the optic disk

C、fovea

D、peripheral of the fovea

E、eripheral of the retina

提问人：网友wu30wu0003 发布时间：2022-01-07

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更多“Cones is mainly located at”相关的问题

第1题

Cones is mainly located at

A、fovea

B、optic disk

C、peripheral of the optic disk

D、peripheral of the fovea

E、eripheral of the retina

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第2题

The human criterion for perfect vision is 20/20 for reading the standard lines on a Snelle

n eye chart without a hitch. The score is determined by how well you read lines of letters of different sizes from 20 feet away. But being able to read the bottom line on the eye chart does not approximate perfection as far as other species are concerned. Most birds would consider us very visually handicapped. The hawk, for instance, has such sharp eyes that it can spot a dime on the sidewalk while perched on top of the Empire State Building. It can make fine visual distinctions because it is blessed with one million cones (视锥细胞) per square millimeter in its retina (视网膜). And in water, humans are farsighted, while the kingfisher, swooping down to spear fish, can see well in both the air and water because it is endowed with two foveae(凹窝)-areas of the eye, consisting mostly of cones, that provide visual distinctions. One fovea permits the bird, while in the air, to scan the water below with one eye at a time. This is called monocular vision. Once it hits the water, the other fovea joins in, allowing the kingfisher to focus both eyes, like binoculars, on its prey at the same time. A frog's vision is distinguished by its ability to perceive things as a constant motion picture. Known as "bug detectors", a highly developed set of cells in a frog's eyes responds mainly to moving objects. So, it is said that a frog sitting in a field of dead bugs wouldn't see them as food and would starve.

The bee has a "compound" eye, which is used for navigation. It has 15,000 facets that divide what it sees into a pattern of dots, or mosaic. With this kind of vision, the bee sees the sun only as a single dot, a constant point of reference. Thus, the eye is a superb navigational instrument that constantly measures the angle of its line of flight in relation to the sun. A bee's eye also gauges flight speed. And if that is not enough to leave our 20/20 "perfect vision" paling into insignificance, the bee is capable of seeing something we can't ultraviolet light. Thus, what humans consider to be "perfect vision" is in fact rather limited when we look at other species.

However, there is still much to be said for the human eye. Of all the mammals, only humans and some primates can enjoy the pleasures of color vision.

The Snellen eye chart measures one's eyesight by ______.

A．the number of lines he reads

B．the number of letter he reads

C．the distance he stands away from the chart

D．the speed at which he recognizes the letters

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第3题

轻水堆冷却剂丧失事故(LOCA)分为()LOCA。

A.轻微

B.小

C.中

D.大

E.严重

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第4题

冷却剂丧失事故失水事故 loss-of-coolant accident 〔LOCA)

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第5题

当先后输入1、3、4、12、23时，屏幕上出现【】；再输入12时，则屏幕上出现【】。 include ＜stdio.h＞ d

efine N 5 main() { int i，j，number，top，bott，min，loca，a[N]，flag； char c； printf("Please input 5 numbers (a[i]＞a[i-1])\n")； scanf("%d"，&a[0])； i=1； while (i＜N) { scanf("%d"，&a[i])； if (a[i]＞=a[i-1)) i++； } printf("\n")； for (i=0；i＜N；i++) printf("%d"，a[i])； printf("\n")； flag=1； while (flag) { scanf("%d"，&number)； loca=0； top=0； bott=N-1； if ((number＜a[0])||(number＞a[N-1])) loca=-1； while ((loca==0) && (top＜=bott)) { min=(bott+top)/2； if (number==a[min]) { loca=min； printf("%d is the %dth number\n"，number，loca+1)； } else if (number＜a[min]) bott=min-1； else top=min+1； } if (loca==0||loca==-1) printf("%d is not in the list．\n"，number)； c=getchar()； if (c==N||c==n) flag=0； } }

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第6题

Pine cones hanging on trees are closed.

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第7题

想把源码包安装在/usr/local/soft下可以使用./configure --prefix=/usr/loca可以使用（)。

A.chdir /usr/loca/soft

B../configure --prefix=/usr/local/soft

C.locate=/usr/local/soft

D.newdir=/usr/local/soft

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第8题