生锈
发表于 2025-3-30 09:11:48
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concubine
发表于 2025-3-30 13:24:54
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遗传学
发表于 2025-3-30 17:25:15
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rods366
发表于 2025-3-30 22:16:52
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Synovial-Fluid
发表于 2025-3-31 04:40:11
Hydrology, stream flow data that are needed for the planning, design and operation of water development projects. Subjects such as river morphology, open channel flow, and reservoir regulation will be discussed in subsequent chapters.
BRUNT
发表于 2025-3-31 08:02:14
Hydrology, stream flow data that are needed for the planning, design and operation of water development projects. Subjects such as river morphology, open channel flow, and reservoir regulation will be discussed in subsequent chapters.
甜瓜
发表于 2025-3-31 10:49:19
Irrigation,any distance, and therefore it is only attractive to develop an irrigation project if the cost of providing extra food through irrigation is competitive with importing that food from somewhere else. Hence, in irrigation development we must compare benefits to costs, whereas in power development we are only concerned with minimizing costs.
Chemotherapy
发表于 2025-3-31 15:33:10
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BROW
发表于 2025-3-31 18:24:14
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deactivate
发表于 2025-3-31 21:47:44
Navigation, move a ton of goods by rail is about 10 times as large as to move it by water. The disadvantage of transport by water is the slow movement and the interruption during the winter in northern climates. Moreover, if the waterways have to be improved by means of dams and shiplocks, much of the economic advantage may be lost.