从未沮丧
发表于 2025-3-21 18:02:02
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施魔法
发表于 2025-3-21 21:39:49
ogy, they measure the discharge from catchments; (ii) In irrigation, they measure and control the distribution of water at canal bifurcations and at off-take structures; (iii) In sanitary engineering, they measure the flow from urban areas and industries into the drainage system; (iv) In both irriga
易于出错
发表于 2025-3-22 03:45:35
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VALID
发表于 2025-3-22 06:43:05
M. G. Bosüber hinaus hatte sich auch das Kaufverhalten vieler Kunden verändert. Die Kunden fragten nicht mehr überwiegend Pumpen im mittleren Leistungsbereich nach, sondern verlangten zunehmend kundenindividuellere Pumpen. Anfragen von Wasserwerken, die entweder Wasserpumpen wünschten, die leistungsstärker o
–DOX
发表于 2025-3-22 12:15:16
M. G. Bosüber hinaus hatte sich auch das Kaufverhalten vieler Kunden verändert. Die Kunden fragten nicht mehr überwiegend Pumpen im mittleren Leistungsbereich nach, sondern verlangten zunehmend kundenindividuellere Pumpen. Anfragen von Wasserwerken, die entweder Wasserpumpen wünschten, die leistungsstärker o
accrete
发表于 2025-3-22 13:50:46
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onlooker
发表于 2025-3-22 19:06:02
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nauseate
发表于 2025-3-23 00:24:23
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accessory
发表于 2025-3-23 04:20:25
History of flumes,es, Hanks, and Jurinak 1982). The irrigated area increased rapidly during the period 1920–40, and remained about constant during World War II and the subsequent period of decolonization. By 1955, the irrigated area was about 120 million ha (Gulhati 1955), and has now increased to about 200 million h
ERUPT
发表于 2025-3-23 07:40:07
Required head loss over the structure,on between the upstream sill-referenced head and the flow rate in the structure. If the downstream sill-referenced head is sufficiently low with respect to the upstream sill-referenced head, modular flow will occur. With high downstream heads, the flow at the control section cannot become critical a