HOWL
发表于 2025-3-23 11:43:31
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Pelvic-Floor
发表于 2025-3-23 17:32:37
N.V. Philips Gloeilampenfabrieken, Eindhoven (The Netherlands) 1971
护身符
发表于 2025-3-23 20:41:14
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CHECK
发表于 2025-3-24 01:31:30
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Infuriate
发表于 2025-3-24 04:35:42
Luminous Flux, Luminous Intensity, Quantity of Light (the .) may be expressed in physical units as ., or in .. Apart from the total energy, we may also consider the amount of energy passing through a certain part of a plane, or within a certain solid angle, and express this in the same units.
入伍仪式
发表于 2025-3-24 07:05:24
Light Distribution, Rousseau and Zonal Luminous Flux Diagramsx in the various directions within the space around the source, i.e. the distribution of the luminous intensity, termed the . of the source. It must also be possible to express this numerically or graphically.
Mercantile
发表于 2025-3-24 14:05:52
The Photometric Measuring-units Systemnceptions and units employed in illuminating engineering would have to be extended in scope to include coloured light, and that, until then, the reader should regard the considerations dealt with as referring to white light only.
debouch
发表于 2025-3-24 17:27:23
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接触
发表于 2025-3-24 20:38:00
Measurement of Illuminationas an intermediate stage in ascertaining values of other photometric quantities, in which case it is usually sufficient to know the illumination as a relative value only. In the foregoing sections on the measurement of luminous flux and luminous intensity, examples of this procedure have already been given.
Mechanics
发表于 2025-3-25 01:11:32
ring less fuel but also smaller than the power reactors and operate at lower temperatures. Generally the fuel is highly enriched uranium that can be typically 20% U-235. The older generation reactors use uranium fuel enriched to 93% U-235..In this chapter, three nuclear research reactor facilities i