青岛专业技术人员-5G理论下载速率将达到（）,是4G的（）倍

5G理论下载速率将达到（）,是4G的（）倍['A.20Gb/s,40', 'B.20Gb/s,20', 'C.40Gb/s,20', 'D.40Gb/s,40']