基本解释六角帽螺钉词组短语短语hexagon head cap screw 六角头螺钉HEXAGON HEAD CAP SCREW FASTENERS 六角头螺丝钉帽socket hexagon cap screw 内六角螺钉hexagon socket cap head screw 内六角圆柱头螺钉hexagon socket head cap screw 内六角螺丝;内六角圆柱头螺钉