Speciationis the process of the formation of new species either by evolution or by genetic modification of the existing species in a population. Factors responsible for speciationare natural selection, genetic drift, geographical isolation and mutation. Extra information:...
相关知识点: 试题来源: 解析 在波的上下文中,位移是指介质中的粒子从其平衡位置移动的距离。 在波的传播过程中,介质中的粒子会围绕其平衡位置振动。位移指的是粒子在某一时刻偏离其平衡位置的距离,可以是正值或负值,取决于粒子相对于平衡位置的位置。反馈 收藏 ...
6.1(i) The glass core is surrounded by a plastic cladding.State and explain which material has a higher refractive index and explain your answer..[2](ii)The light ray enters the air-glass interface at 45°.Calculate the angle of refraction in the glass core.angle of refraction =...[2]...
That iswhat is meant by" failure is the mother of success " " 失败是成功之母 " 就是这个意思. 互联网 Hobson :What is meant bythe term Clearing House Association? 霍布森: 票据交换是什么意思? 互联网 What is meant bya longitudinal and transverse weld?
这里meant 是mean 的被动语态。例(1)：主动语态： “Forthrightness” means what?被动语态： What is meant by “forthrightness”?例(2)：主动语态： Rita writes a letter.被动语态： A letter is written by Rita.例(3)：主动语态： 一辆车撞死了行人 被动语态： 行人被一辆车撞死...
xxx is meant by 某某某 相关知识点: 基础积累与运用 句子 句式与句类 陈述句 试题来源: 解析 mean 意味着,意思是 be meant 这里是个被动语态,一般会出现在问题中吧.比如说:What is meant by “where there is a will,there is a way”?就是“. 分析总结。 bemeant这里是个被动语态一般会出现在问题中...
What is full pitch and half pitch? From the above, we conclude that, In a full pitch coil, the coil span willbe 180° electrical( equal to pole pitch ). In a short pitch coil, the coil span will be (180 - α)° electrical ( α = angle by which coils are short-pitched and alw...
1 In order to understand, however imperfectly, what is meant by "face", we must take (1) of the fact that, as a race, the Chinese have a strongly (2) instinct. The theatre may almost be said to be the only national amusement, and the Chinese have for theatricals a (3) like tha...
To help visualize what is meant by a gravitational field we may use lines of force.下划线部分在句中做 ___。 A、主语 B、宾语 C、状语 D、定语
4 (a) State what is meant by the term polarisation when applied to a wave.[1](b)Explain why only transverse waves can be polarised.[2](c)Some films released have enabled viewing in three dimensions (3D). This can be done using two superimposed polarised images on the screen. One of ...