有奖纠错
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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.

螺旋槽管(亦称螺纹管)是其中,它是种优良高效异形强化传热管件。

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deassimilation, deastringent, death, death adder, death benefit, death blow, death cup, death duty, death knell, death mask,

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3G, 401(K), a,

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TED-Ed(视频版)

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.

插入个螺丝,然后用牙线螺丝的螺纹之间张,形成系列微小的等距波纹

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death wish, deathbed, deathblow, deathcup, deathday, death-feigning, deathful, deathin, deathless, deathlike,

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3G, 401(K), a,
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