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The mainstructure parameters of spirally grooved tube are diameter of tube, fin pitch,corrugation depth, wall thickness, spirally angle and spira.

管(亦称螺纹管)是其中的一个要分支,它是一种优良的高效化传热管件。

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conventicle, convention, conventional, conventionalise, conventionalism, conventionalist, conventionality, conventionalization, conventionalize, conventionalloading,

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3G, 401(K), a,

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TED-Ed(视版)

He inserts a screw into one end, and using a piece of dental floss, crushes the paper between the threads of the screw creating a series of tiny equidistant corrugations.

他在端插入个螺丝,然后用牙线在螺丝的螺纹之间压碎纸张,形列微小的等距波纹。

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convergency, convergent, convergent thinking, convergent-divergent, convergents, converger, convergescence, convergeuniformity, converging, converging lens,

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3G, 401(K), a,
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