采购产品书桌配件, 钢笔和书写工具, 圆珠笔钢笔, 引导电笔, 多功能钢笔.Desk Accessories, Pens and Writing Instruments, Ballpoint Pens, Led Light Pens, Multifunctional Pens.本文针对当前发展的要求,采用微小角度检测原理,提出了一种多参数签名鉴定电笔.This paper presents an electrical pen for s...
无翼飞机首次试飞预计将于4个月内实施.WEAV is expected to first trial flight in 4 months.之所以选用Aptera这个名字,是因为这种电动车像小型的无翼飞行器.The name Aptera was chosen because the vehicle resembles a small, wingless aircraft.也许我们命中注定只能在梦中做无翼飞行,而在现实中永远叶做不到.P...