作者: condescend 時(shí)間: 2025-3-21 20:48
Macmillan Publishers Limited 1991作者: GRIPE 時(shí)間: 2025-3-22 01:32
Science for You,Science is the study of everything in the universe — including the planet Earth, its atmosphere and every living thing.作者: ethnology 時(shí)間: 2025-3-22 05:57 作者: calorie 時(shí)間: 2025-3-22 10:27
Matter,Scientists use the term matter to include all materials. . is defined as .. And a space from which all matter has been removed is called a .. Matter exists in three states:作者: 貧窮地活 時(shí)間: 2025-3-22 14:25
Growth and its measurement,As a crystal grows it gets bigger but its shape does not change. But as a plant or animal grows it does not just get bigger, its shape also changes. Members of a given species have a characteristic body shape at each stage of development and growth.作者: 允許 時(shí)間: 2025-3-22 20:07 作者: 猛擊 時(shí)間: 2025-3-22 22:02
A closer look at life,Many scientific instruments extend our ability to observe. In this way they make new observations possible. For example, with binoculars or a telescope you can see objects or details some distance away that you would not be able to see unaided.作者: 紋章 時(shí)間: 2025-3-23 01:52
The composition of matter,All materials are composed of either pure chemical substances or mixtures of chemical substances.作者: opportune 時(shí)間: 2025-3-23 07:45 作者: 過去分詞 時(shí)間: 2025-3-23 11:19
Energy, work and power,The universe consists of matter and energy. Science, therefore, is the study of both matter and energy. In contrast to matter, which occupies space and has mass, energy does not occupy space and it has no mass. . may be defined as . or as ..作者: 獸群 時(shí)間: 2025-3-23 16:33
,Air: Earth’s atmosphere,Earth’s atmosphere is a mixture of colourless gases (see Figure 11.1), held near Earth by the pull of Earth’s gravity. You cannot see air, but you feel it when the wind blows, when you move quickly through still air, and as you breathe deeply.作者: refine 時(shí)間: 2025-3-23 18:48
Machines,.. We need to consider only simple machines.作者: 釋放 時(shí)間: 2025-3-23 23:57
Energy from sunlight,You will remember that in sunlight green plants add oxygen to the air. In 1860, about 100 years after Priestley’s work on the effects of plants and animals on the composition of air (see page 118), a German botanist Julius von Sachs demonstrated that in sunlight green leaves increase in mass.作者: eucalyptus 時(shí)間: 2025-3-24 04:44 作者: fodlder 時(shí)間: 2025-3-24 07:43
Matter and energy from your food,Of the 94 elements that occur naturally, only about 22 (all of low atomic mass) are essential constituents of living organisms.作者: instate 時(shí)間: 2025-3-24 13:47 作者: recession 時(shí)間: 2025-3-24 16:50 作者: Ledger 時(shí)間: 2025-3-24 20:09 作者: 責(zé)任 時(shí)間: 2025-3-25 01:01 作者: 食料 時(shí)間: 2025-3-25 05:08
Light and seeing, light source, in a darkened room, a sharp edged shadow is formed in the region of less intense light — indicating that . (see Figure 17.1). You can imagine light spreading from the point source in all directions, as rays, in straight lines. However, in a diagram (such as Figure 17.1) only those ray作者: Ambulatory 時(shí)間: 2025-3-25 07:57 作者: 消毒 時(shí)間: 2025-3-25 12:52
indicators.Unique consistent comparison of various national.The concept of National Systems of Innovation was introduced as a method to describe the various elements which contribute to innovation performance and their interaction. Most analyses refer to the description of the structures of specifi作者: 挫敗 時(shí)間: 2025-3-25 18:01 作者: Overthrow 時(shí)間: 2025-3-25 23:59 作者: 重力 時(shí)間: 2025-3-26 01:22 作者: 翅膀拍動(dòng) 時(shí)間: 2025-3-26 05:43 作者: 規(guī)范就好 時(shí)間: 2025-3-26 11:42 作者: 得體 時(shí)間: 2025-3-26 15:08 作者: 制度 時(shí)間: 2025-3-26 20:49 作者: Recess 時(shí)間: 2025-3-26 21:46
Robert Barrassand their interaction. Most analyses refer to the description of the structures of specific countries, whereas the comparison of different countries generally fails due to the inconsistency of information sources or the lack of specific data. In this book, the innovation structures of a broad set of作者: 相同 時(shí)間: 2025-3-27 01:30
Robert Barrassand their interaction. Most analyses refer to the description of the structures of specific countries, whereas the comparison of different countries generally fails due to the inconsistency of information sources or the lack of specific data. In this book, the innovation structures of a broad set of作者: Sputum 時(shí)間: 2025-3-27 06:50 作者: 做方舟 時(shí)間: 2025-3-27 13:06 作者: 絕食 時(shí)間: 2025-3-27 17:22
Robert Barrassand their interaction. Most analyses refer to the description of the structures of specific countries, whereas the comparison of different countries generally fails due to the inconsistency of information sources or the lack of specific data. In this book, the innovation structures of a broad set of作者: allude 時(shí)間: 2025-3-27 20:33 作者: Commodious 時(shí)間: 2025-3-27 23:54
Robert Barrassand their interaction. Most analyses refer to the description of the structures of specific countries, whereas the comparison of different countries generally fails due to the inconsistency of information sources or the lack of specific data. In this book, the innovation structures of a broad set of作者: forecast 時(shí)間: 2025-3-28 03:50 作者: 好忠告人 時(shí)間: 2025-3-28 07:18 作者: 牽連 時(shí)間: 2025-3-28 14:17 作者: Canyon 時(shí)間: 2025-3-28 16:39 作者: convulsion 時(shí)間: 2025-3-28 20:59 作者: adipose-tissue 時(shí)間: 2025-3-29 00:26 作者: 委托 時(shí)間: 2025-3-29 03:05 作者: 植物群 時(shí)間: 2025-3-29 08:07
Light and seeing,magine light spreading from the point source in all directions, as rays, in straight lines. However, in a diagram (such as Figure 17.1) only those rays needed to show the position of the shadow are represented.作者: 創(chuàng)作 時(shí)間: 2025-3-29 12:27
The use of matter and energy in your body,9.2), your small intestine has a very large surface area of epithelial cells absorbing the products of digestion. When molecules absorbed after digestion become part of the cells and tissue fluids of your body, they are said to have been assimilated.作者: ciliary-body 時(shí)間: 2025-3-29 16:37 作者: Cytology 時(shí)間: 2025-3-29 21:48 作者: chapel 時(shí)間: 2025-3-30 02:09 作者: GROVE 時(shí)間: 2025-3-30 05:15 作者: 不可接觸 時(shí)間: 2025-3-30 09:47
No previous knowledge of the subject is assumed. Science is presented in historical perspective, as an aspect of human endeavour, and reference is made to the economic importance, environmental impact, and social consequences of many discoveries. Simple investigations are included to encourage caref作者: 誘導(dǎo) 時(shí)間: 2025-3-30 12:44
jor elements of the joint work of eight leading German institutes, elaborated in the context of a regular annual report on Germany‘s technological performance. It provides much more than the pure compilation of978-90-481-7226-9978-1-4020-4949-1作者: onlooker 時(shí)間: 2025-3-30 20:29 作者: intention 時(shí)間: 2025-3-31 00:47 作者: 逃避責(zé)任 時(shí)間: 2025-3-31 04:03
Robert Barrassjor elements of the joint work of eight leading German institutes, elaborated in the context of a regular annual report on Germany‘s technological performance. It provides much more than the pure compilation of978-90-481-7226-9978-1-4020-4949-1作者: Override 時(shí)間: 2025-3-31 08:23 作者: 我吃花盤旋 時(shí)間: 2025-3-31 09:23 作者: 銀版照相 時(shí)間: 2025-3-31 14:08
Robert Barrasss in innovation policy are presented in an international comparison. The book documents major elements of the joint work of eight leading German institutes, elaborated in the context of a regular annual report on Germany‘s technological performance. It provides much more than the pure compilation of作者: Glucose 時(shí)間: 2025-3-31 18:47
Robert Barrasss in innovation policy are presented in an international comparison. The book documents major elements of the joint work of eight leading German institutes, elaborated in the context of a regular annual report on Germany‘s technological performance. It provides much more than the pure compilation of作者: PAC 時(shí)間: 2025-4-1 00:40 作者: 傳染 時(shí)間: 2025-4-1 05:46
