在上半身,用英语怎么说

（1）王晓华同学的身体质量m；王晓华同学上升的高度h；王晓华同学连续匀速做16个规范的引体向上所用的时间t。
（2）

你这问我就对了,我是读物理的.由于开车是我们人随着车子向前行,突然刹车时,我们还会随车继续前进,我们下半身坐着,所以不易前行,这就是为什么我们要系安全带的原因了.

1.D
2.85cm
3.7.5/360=L/(2*3.1415926*R)
4.千万不要答漫反射和镜面反射.因为漫反射和镜面反射是在同一侧的.以为粗糙,射出的光线不能集中而是分散了,所以会模糊.
5.在外面太阳光比里面的光线强的多,外面反射的光线比里面射出的光线强,因此你看不见里面.就是这个原因.

解题思路：根据平面镜成像特点，平面镜所成的像与物体大小相同，平面镜所成的像是虚像．

由题意可知“某人站在镜前1m处，从镜子里只能看见自己的上半身”，因为平面镜所成的像与物体大小相同的，所以他不管是前进还是后退，从镜子里也只能是看见自己的上半身，所以A、B、C的做法都不能实现．
故选D．

点评：
本题考点： 平面镜成像的特点、原理、现象及其实验方案．

考点点评： 本题主要考查了平面镜成像特点的应用．

第一题2.472 4*0.618=2.472
第二题9 面积比为4：9则边长之比为2：3
所以为9

1.无论如何移动都不能成功，只有更换较大的镜子。
因为只有当镜子长度大于身高的一半时才能看到全身像，体重镜子只有身高的四分之一。
3。凸透镜
4。因冰块上有一定压力，冰块熔点升高，融化。蜡线落下，冰块重新冻结。

（1）你所说的看到全身像是视觉差距,并不是整个人作为一个点,所以根本无法说明,其次,虚像和实像在平面镜中都是等大的（就是说除去凹凸透镜）,无论距离多少,像的大小不变,人像距离就是人离镜子的距离再乘2（就是人到镜子的距离的两倍）rn（2）在1说过,人像距离都是这样的算法,所以答案为0.25mrn（3）跟2所做的原理一样,只是参考系不同（不明白参考系的可以百度下）,也就是说,可以当成人移动镜子不动的情况一样,就可以解决

1.能看见.
2.凹凸镜.
3.平面镜的话要1/2才能看见或者更大,因为平面镜反映的是最真实的虚像.这是常理,没为什么.想多了也没用.呵呵!

解题思路：根据平面镜成像特点，平面镜所成的像与物体大小相同，平面镜所成的像是虚像．

由题意可知“某人站在镜前1m处，从镜子里只能看见自己的上半身”，因为平面镜所成的像与物体大小相同的，所以他不管是前进还是后退，从镜子里也只能是看见自己的上半身，所以A、B、C的做法都不能实现．
故选D．

点评：
本题考点： 平面镜成像的特点、原理、现象及其实验方案．

考点点评： 本题主要考查了平面镜成像特点的应用．

解题思路：根据离镜远时，人在镜中的像也远，有更多的反射光线进入人的眼睛，观察到的范围变大了，这一特点进行分析，即可解答此题．

因为平面镜成的像与物大小相同，和物到镜的距离无关，所以无论人向前或向后移动或将镜子高度降一些，都无法看到自己更大部分的像．
故选D．

点评：
本题考点： 平面镜成像的特点、原理、现象及其实验方案．

考点点评： 人们感觉到的近大远小是一种视觉效果，不影响真实的大小．这是理解平面镜成像特点的一个难点，需细心领会

不能,这种坐姿,想站起来必须重心前移,那么坐姿就改变了.一次成功的站起,就得把重心移动到垂直（或相近）的一条线上.

下半身和椅子紧靠,实际上,车开动时,身体速度和车子速度一样的,车子突然停下时,下半身和椅子之间有摩擦力,使下半身速度和车子一样,而上半身没有受到阻力,任然会往前倾.

解题思路：根据平面镜成像特点，平面镜所成的像与物体大小相同，平面镜所成的像是虚像．

由题意可知“某人站在镜前1m处，从镜子里只能看见自己的上半身”，因为平面镜所成的像与物体大小相同的，所以他不管是前进还是后退，从镜子里也只能是看见自己的上半身，所以A、B、C的做法都不能实现．
故选D．

点评：
本题考点： 平面镜成像的特点、原理、现象及其实验方案．

考点点评： 本题主要考查了平面镜成像特点的应用．

两种答案一种是长与圆形挨着
这个图形周长=20π+20+14*2
=20π+48
当π≈3.14时
周长=11.8
第二种宽与圆形挨着
周长=14π+20*2+14
=14π+54
当π≈3.14时
周长=97.96

水蒸气都到被子上了,这些水蒸气很难散出去,因此弄得衣服也很潮!
你直接把衣服放在上面,慢慢水蒸气就都散去了,外面那层小水珠没啥影响,实际上衣服已经干了!

上半身
the upper half of the body
the upper part of the body
下半身
the lower half of the body
the lower part of the body
英文中描述一个人的穿着一般直接讲他（她）具体穿的什么,是夹克、西装还是T恤,是裤子、裙子还是短裤,文中一般不会再提到“the upper half of the body”等表示身体部位的词语,而中文可以说“上半身、下半身”,也可以不提.
例如：
My uncle dressed in T-shirt and shorts.
我的叔叔上身穿着T恤,下面穿着短裤.
She was wearing a short silk lined jacket of pale green and wide black crepe trousers.
她穿着件浅绿的绸子小夹袄和一条青洋绉肥腿的单裤.

阻力不是一种力 是阻碍运动的力就是阻力 所以不能跟摩擦力相提并论 这里说阻力摩擦力都对

压力 许三多说 日子过得太舒服了 会犯错误滴

他们的心就像那树干一样,已经被紧紧地扎根于道德观念所相背驰的路上.
标题：心树.因为他们的心就像树一样了.

解题思路：根据平面镜成像特点，平面镜所成的像与物体大小相同，平面镜所成的像是虚像．

由题意可知“某人站在镜前1m处，从镜子里只能看见自己的上半身”，因为平面镜所成的像与物体大小相同的，所以他不管是前进还是后退，从镜子里也只能是看见自己的上半身，所以A、B、C的做法都不能实现．
故选D．

点评：
本题考点： 平面镜成像的特点、原理、现象及其实验方案．

考点点评： 本题主要考查了平面镜成像特点的应用．

d 要想看到全像,镜子的长度必须为人的长度的二分之一 如果在某处看不到全像,则所有距离均看不到
用人的眼睛与镜子最上端与最下端连线,由于人与镜子的距离等于镜子离像的距离,用相似三角形可得

Various bacteria survive in different environment, and through different approach spread. A statistics, the upper body in people per square centimeter skin is 50 a 5,000 microbes, they get from the sweat and the secretion of a growth, reproduction nutrition, death metabolism. Sweat or the fatty acid, lactic acid secretion inside can kill many organisms. What of microbiology could have also killed or disaster live action, constitutes the balance coordination of nature. Microbial were widespread, even though they live on human production have certain positive role, but they also often make industrial equipment from corrosion, make food and raw material of corruption and metamorphism, even with food for the media to cause human body poisoning, disease, cancer and death.
1, microbial role
1.1 microorganisms in the role of material circulation in biosphere material circulation process, mainly with different type of microbial organic decomposers in the process of mineral play an irreplaceable role in producers together, it pushes the material circulation, biological inside that ecosystem balance. For example, in the carbon cycle, on the earth, 90% of the co 2 is produced by microbial life activities; In nitrogen cycle, nitrogen fixation function, amination function, nitrification, denitrifying action have the action of microorganisms; In phosphorus and sulfur cycle in the same also need various microbes activities.
1.2 microorganism and sewage treatment industry rapid development of also has brought people certain environmental pollution. In many of the sewage and waste water treatment method, biological treatment because of its economic convenient, good effect is prominent advantages and has been widely used. In the wastewater treatment process of biology, microbiology plays a particularly important role in water, they can turn organic carbon decomposed into CO 2, H 2 s, CH 4 gas, such as; Will contain nitrogen organic material is decomposed into ammonia, nitric acid, proposed and nitrogen; Can make mercury, arsenic of human toxic heavy metal salt in water in transformation, in order to remove, make many recycling or pathogenic sex parasites often die because of and environmental discomfort.
130 be beneficial to human body health human intestinal contains a variety of microbes, which mainly has e. coli, produce gas bacillus, deformation bacteria, dung produce alkali bacteria, compared with perfringens spindle bacteria, lactobacillus and helicoid, etc. The human body for these microbes provides good perched place, and these bacteria living in intestinal can synthetic lactoflavin, vitamin B12 vitamin K and so on many kinds of vitamins and amino acids for the body to absorb use.
There are many food (such as 1.4 soy sauce, vinegar, monosodium glutamate, wine, yogurt and cheese, mushrooms), industrial goods (such as leather, textile, petrochemical), drugs (such as antibiotics and vaccines, vitamin, ecological pesticide) is dependent on microbial manufacturing; Microorganisms in mineral exploration and mining, waste disposal (water purification, biogas fermentation) in various fields such as also play an important role. Microbes are only the nature of cognitive nitrogen-fixing (such as rhizobium fredii) of plants and animals residues of people (such as cellulose degradation in common, and degradation) at the end of the chain, thus finish first ends carbon, nitrogen, and sulfur and phosphorus in the cohesion theory of biomass. If there is no microbes, many biological lose the necessary nutrients to source, plant fiber residues cannot decompose and the infinite accumulation, there is no nature current prosperity and order or human generation and dimension renewal.
1.5 microorganism and closely related to human health. Most microbes to the human body is harmless. In fact, the human body outer surfaces (such as skin) and the inner surface (such as bowel) live many normal, beneficial bacterium group. They hold these surface and produce natural antibiotic, restrain harmful bacterium landing and growth; They also assist absorption or personally manufacturing some human body essential nutrients, such as vitamins and amino acids. The flora of disorders (such as antibiotic abuse) can lead to infection or nutritional deficiencies. But on the other hand, human and animal and plant diseases and many are caused by microorganisms, these microbes pathogenic microorganism called pathogenic microorganism (or pathogen (pathogen)