... 开普封层 Cape seal 封头及壳体开孔 head and shell openings 封头和壳体开孔 headandshellopening ...
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Openings, head and shell, computation of.
开孔，封头和壳体，计算。
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Preferably, the streamline surface of the shell is gradually shrunk from the head to the tail, and the rear openings are symmetrically distributed around the Central Line of the shell.
优选的，所述壳体的表面流线型由头部到尾部逐渐收缩，所述后开口围绕所述壳体的中心线对称分布。
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