泛在识别
ubiquities identification
《字节》杂志的信息交换在线服务
BIX BYTE Information Exchange
20岁在校学生
Chinese teenagers of 20 years old age
2π周期解的存在性和唯一性
existence and uniqueness of 2π-periodic solution
3D CAD在线数据标准化
standardization of 3D CAD online data
3DCAD在线数据标准化
standardization of 3D CAD online data