Hydraulic impulse testing equipment was used for producing standard shape of impulse trace when testing for hoses and tubing assemblies.

液压脉冲设备是用来对液压软管、导管组件进行冲击试验时，产生符合标准的脉冲波形。

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Even the extreme angle isn't a problem, partly because of perceptual constancy the brain's tendency to see familiar objects as having a standard shape and size, despite changes in perspective.

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Not only would passengers have to accept windowless flight, but several technical problems would also need to be overcome, including the need to manufacture pressurised cabins that are not the standard tubular shape.

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If Amazon does participate, says Forrester research analyst James Staten, the company will likely use its heft in the cloud computing industry to assert control over the standard and shape it to Amazon's current services.

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