概念题：技术前沿（technology frontier）
举一反三
- 新技术的前沿—————s of new technology
- The college campus, long a place of scholarship and __________ of new technology, is being _________ into a new age of electronics. A: front, transform B: frontier, transmitted C: frontiers, transformed D: frontiers, transmit
- 概念题：边际技术替代率
- 突破性的技术______ technology
- 15. barcode technology：二维码技术