we can obtain the frequency if the time period is given. The frequency is expressed asHz. TheHz full formis hertz.1 hertz is equal toone cycle per second .For a wave, frequency is the number of cycles per second. We have also seen the formula relating the frequency, wavelength and ...
Period 1-Welcome to this unit Period 2-Reading 1 (Comprehension focus) Period 3-Reading 2 (Word focus) Period 4-Reading 3 (Consolidation of words) Period 5-Word power1 Period 6-Word power2 Period 7-Grammar & usage Period 8-Consolidation of grammar Period 9-Task presenting a dialogue1 Peri...
介词for后接一段时间,意思是“经过……之久”,对其提问时,要用How long。 例如: -I watch TV for three hours. 我看电视三个小时了。(对划线部分提问) -How long do you watch TV? 你看电视多长时间了? 教学视频 Unit...
Stephen Hawking was one of the most famous and gifted scientists in physics. Most people are familiar with images of him in his wheelchair, unable to move and using a computer to talk. Since he came down with a disease which caused him...
.by solving new math problems every dayby doing extra exercisesmemorizing chemical terms and doing experiments.Grammar4b Make sentences using the structure “do sth. by doing” with the subjects in the box and information that is true for you. math physics chemistry Chinese history geographye.g....
2. we do a physics experiment in the lab once a week. 3. he left for a variety of reasons. 4. she charged me 10 dollars for the service. 5. many of my classmates hope that they can work as volunteers for the 29th olympic games in beijing. (三)1. for pay for为……付钱 2. ...
into a liquid and leave it there for a period of time 浸;泡 e.g. 1. She soaked the shirt in soapy water. 她把衬衫泡在肥皂水里。 2. Before cooking them you should soak the beans overnight in water. 煮之前,你得把豆子浸泡在水里一整夜。 See also: soak up Words & Phrase...
SectionA:Choosethebestwaytocompletethesentences.1.Theresearcherhadathatacademicachievementwaslinkedtoculture.2.Iwouldlov
For the discovery of radium, Marie and Pierre won a Nobel Prize in Physics in 1903. Also for this work, she was given the Nobel Prize in Chemistry in 1911. During the first World War, Marie Curie knew that taking soldiers to a hospital when they needed operations was not always possible...
which holds that the universe began at a single point in time and space. The biggest champion of the steady stateconceptwas Fred Hoyle, a professor at Cambridge. During the question and answer period after one of Hoyle’s ...