... local velocity fluctuation (流量计的)局部速度起伏,局部速度变动 local velocity of sound 局部声速,当地声速 local vent 局部排气;就地排气,局部通风 ...
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Flow velocity, at this location, can never exceed the local speed of sound, and is said to be in a choked condition.
流速,在这个位置,绝不能超过当地音速的,据说是在一个呛条件。
Here the gas velocity corresponds to a Mach number of one, denoting that the flow velocity is equal to the local speed of sound of the particular gas.
在这里,气速对应到一个马赫数之一,指该流速等于当地音速的,特别是天然气。
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