杠杆
发表于 2025-3-30 10:30:58
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integrated
发表于 2025-3-30 16:05:27
Plastic Behaviour,ecoverable. If the stress is removed elastic strain is recovered but the material will be left in a state of permanent, or plastic, strain. The mechanism of plastic deformation is not the same for all classes of materials and it is necessary to consider the various materials groups separately.
INCUR
发表于 2025-3-30 20:08:36
Electrical and Magnetic Properties, to be emitted. This energy is emitted as a discrete packet or .. These quanta released by excited atoms are called . and photons travel at the speed of light. The magnitude of energy quanta is of the order of 10. J and it is customary to use the electron volt as a unit of energy for these low values, rather than the SI unit of energy, the joule.
占线
发表于 2025-3-30 22:08:08
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Canyon
发表于 2025-3-31 03:41:02
Atomic Structure and Bonding, an engineer is: ‘one who designs or carries out the construction of works of public utility; one who constructs engines.’ It will be apparent that no matter how brilliant a new piece of engineering design may be, it is of no avail if there are no suitable materials available for converting the design into ‘hardware’.