在参加该项目之前必须结清余账。You have to pay your outstanding bill before joining the scheme.戴维发誓要离开这个项目，我不得不对他表示钦佩。I had to admire David's vow that he would leave the programme.服务项目包括避孕建议和健康检查，并且免费提供。The service covers contracep...
为批量生产带有螺纹的尼龙旋塞,设计了一种带有螺旋顶杆的旋塞注塑模.Mold with spiral ejection pin was designed for the mass production of threaded nylon cock.所述长顶杆的前端最好为锥形头.The front end of the long post rod is at best in a cone shaped head.随着温度升高, 感温元件(阀...