According to whether the moving elements change with time, the flow is divided into uniform flow and non-uniform flow.
错误
举一反三
- According to the different causes, gap flow can be divided into three types: differential pressure flow, shear flow and ( ) flow.
- How is flow around a half body obtained? ( ) A: By adding a sink to a uniform flow B: By adding a vortex to a uniform flow C: By adding a source to a uniform flow D: By adding a source and a sink
- In the pipe flow, the cross-section velocity distribution of laminar flow conforms to （ ） A: Uniform law B: Law of linear change C: Parabolic law D: Law of logarithmic curve
- The material flow can be divided into the following ( ) two categories according to whether the material flow is mainly caused by human activity A: Material biogeochemical flow and its anthropogenic flow B: Material flowing with the atmosphere and with the water body C: Material industrial and agricultural flows D: Material industry flow and consumption flow
- What best describes the normal blood flow to the lungs in a supine patient? （ ） A: largely uniform B: decreased flow to apices relative to bases C: increased flow to upper lobes
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Every transaction in electronic commerce includes information flow, commercial flow, （） and material flow. A: merchandise flow B: data flow
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Cross-border E-commerce _______ logistics, information flow, capital flow, and document flow.
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The three main flows of the supply chain are the product flow, the information flow and the staff flow.（ ）
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When roughing cast iron, the mainly cooling cutting fluid should be added with sufficient and uniform flow .
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The volume of the water flow and the change in _____ from one point to another determine the amount of available energy in moving water.( ) A: water flow B: fall C: water speed D: elevation