gloomy 发表于 2025-3-21 17:09:06

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Carminative 发表于 2025-3-21 23:14:39

Recent History and Strategic Adaptations,The main sub-atomic particles are the proton, electron and neutron.

利用 发表于 2025-3-22 03:04:36

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一瞥 发表于 2025-3-22 04:40:49

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防御 发表于 2025-3-22 09:02:16

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Root494 发表于 2025-3-22 14:59:26

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Root494 发表于 2025-3-22 17:23:53

Eye and Binocular: The Man-MachineThe hardness of metals can be defined as resistance to plastic deformation and test methods are based on forcing an indenter into the surface under a known load. Two such tests are the Brinell test and Vickers diamond test. In each case the hardness number is given by indenting force divided by the surface area of indentation.

有斑点 发表于 2025-3-23 01:09:08

Atomic Structure and Bonding,The main sub-atomic particles are the proton, electron and neutron.

充气女 发表于 2025-3-23 02:48:14

Thermally Activated Reactions and Diffusion,Many processes are thermally activated and the rate at which the process occurs varies exponentially with temperature. The law which governs these processes is the Arrhenius law which can be written:. where . is the reaction rate (s.)

Talkative 发表于 2025-3-23 08:11:59

Iron and Steel,The iron-carbon phase diagram is the key to an understanding of steels and cast irons. This diagram is shown below.
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