减少空气阻力，从而降低燃料消耗。
水钉的作用，使土钉体外表面与土体界面接触粘结力与摩擦阻力显著降低。
By action of water to nail, Bond between soil and nail a was obviously reduced.
头降低在身体直线上会减少阻力。
本发 明可有效地降低过滤阻力及减轻滤料磨损。
Said invention can effectively lower filtering resistance and reduce wear of filtering material.
本发 明可有效地降低过滤阻力及减轻滤料磨损。
Said invention can effectively lower filtering resistance and reduce wear of filtering material.
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