基本解释[經濟學]人字正齒輪英汉例句雙語例句English Name:Gear drawing standards - Part 1: For Spur, helical, double helical and rack.簡躰中文標題：齒輪制圖標準。第1部分正齒。螺鏇齒。雙螺鏇齒和齒條。double helical spur gear更多例句词组短语短語double e helical spur gear 人字正齒輪double helical spur gear更多词组专业释义經濟學人字正齒輪