短語(yǔ)詞組短語(yǔ)endless tangent screw sextant 無(wú)限正切螺絲型六分儀;[水運(yùn)]微調(diào)螺桿六分儀endless chain conveyer tangent screw 微調(diào)蝸桿螺釘 返回 endless tangent screw