摘要
发表于 2025-3-26 23:42:03
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aptitude
发表于 2025-3-27 01:10:20
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圆木可阻碍
发表于 2025-3-27 09:18:08
Acids, Bases and Salts,Acidity is measured on the ., a scale of numbers normally ranging from 0 to 14. A pH value of 7 is neutral, less than 7 is acidic and more than 7 is alkaline. A . gives different colours corresponding to different pH values, typical results being red for pH = 1, purple for pH = 14.
CORD
发表于 2025-3-27 11:12:56
The Metals,When metals are arranged in order of decreasing chemical reactivity, the . is obtained. The chemical properties of a metal and its compounds are related to the position of the metal in the reactivity series as shown in Table 12.1.
削减
发表于 2025-3-27 14:05:12
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Postulate
发表于 2025-3-27 19:20:33
Nitrogen,Nitrogen forms about 78% of the air and can be prepared from it by removing oxygen and carbon dioxide. Industrially, nitrogen is obtained by the fractional distillation of liquid air (see Section 9.2).
下垂
发表于 2025-3-27 23:00:45
Oxygen and Sulphur,Oxygen is the most abundant element in the Earth’s crust; it also forms 21 % of the atmosphere.
Lipoprotein
发表于 2025-3-28 05:35:54
Some Industrial Processes,Industrial processes are designed to manufacture products as economically as possible, taking into account both the speed and the cost of operation.
痛苦一生
发表于 2025-3-28 08:33:40
Chemical Analysis,This section has been restricted to the detection of the following ions:., K., Na., Ca., Al., Zn., Fe., Fe., Cu., . and Cl..
Foreshadow
发表于 2025-3-28 11:53:22
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