Banister
发表于 2025-3-27 00:50:09
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莎草
发表于 2025-3-27 02:49:30
Control of lead in air,described in this chapter. Nevertheless, as shown in Chapter 2, industrially emitted lead may have a considerable local effect upon air quality, and if ambient air quality standards such as that in the USA (1.5 μg m.) are to be met, then considerable improvements in emission control installations will be required.
intelligible
发表于 2025-3-27 06:52:49
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orthopedist
发表于 2025-3-27 12:24:11
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Gastric
发表于 2025-3-27 15:28:20
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eustachian-tube
发表于 2025-3-27 18:25:43
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Deject
发表于 2025-3-27 23:18:31
Lead in water,Elevated levels of lead in water arise principally from industrial discharges, highway runoff and weathering processes in areas of natural lead mineralization. Once the lead has entered a water body its mobility and distribution will be closely controlled by its chemical forms. These will alter according to the nature of the particular water body.
Small-Intestine
发表于 2025-3-28 05:07:11
Introduction,durability of lead account for its early use as a construction material. The use of lead pipes for water supply was particularly significant during the period of the Roman Empire. Lead has also been used over the years as a glaze on pottery, in cosmetics and as a means of sweetening wine .
招人嫉妒
发表于 2025-3-28 06:47:46
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Lasting
发表于 2025-3-28 13:16:49
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