“field trial”的概念、定义、翻译、参考文献-科学参考

单词	field trial
释义	field trial Encyclopedia 医学现场试验释 field trial现场试验在社区的现场条件下，以尚未患某病的人作为研究对象，按随机分配原则将研究对象分为实验组和对照组，实验组给予某种干预措施（研究因素），对照组不给予干预措施或给予安慰剂，比较两组结局的方法。又称人群预防试验。
随便看	theorem of prime numbers theorem of principal axes theorem of proportion by addition theorem of proportion by addition and subtraction theorem of proportion by alternation theorem of proportion by inversion theorem of proportion by subtraction theorem of ratio of equality theorem of residues theorem of Riemann-Roch type theorem of Stoll type theorem of Tauberian type theorem of termwise differentiation theorem of the complete quadrangle theorem of the cube theorem of the square theorem of three perpendiculars theorem of topological degree theorem of total probability theorem of unique prime factorization theorem on addition of probabilities theorem on braids theorem on composition of accelerations theorem on composition of angular accelerations theorem on composition of angular velocities

科学参考收录了854744条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。