abbr. Daughters of the (American) Revolution;【航海学】dead reckoning;Dutch Reformed r and d: R and D,R & D =research and development 研究与发展。 drilling r and d: 钻井研究开发r and d program: 研究与发展, 开发规划f r z b d: 菲鲁扎巴德gūdūr: 古杜尔下载手机词典可随时随地查词查翻译