齿轮箱油尺

Lesson 49 Father tells a joke Father is teaching mother to drive the car. He's very impatient. Mother says he's the worst teacher in the world. Father says woman drivers are terrible. He told mother a joke about a woman driver he knows. This lady dro

发表于:2018-12-20 / 阅读(160) / 评论(0) 分类 朗文3L看听学英语第四册

金属切削 metal cutting 机床 machine tool 金属工艺学 technology of metals 刀具 cutter 电路 circuit 半导体元件 semiconductor element 反馈 feedback 发生器 generator 直流电源

发表于:2019-01-08 / 阅读(178) / 评论(0) 分类 英文语法词汇