alternation number

基本解釋

Examples of quasi-random methods of assignment include alternation, date of birth, and medical record number.
準(zhǔn)隨機(jī)分配方法包括：交替分配，根據(jù)出生日期分配及根據(jù)病例號(hào)分配等。
In this study, we measured the type, structure, number, seasonal alternation and harm of weed in the turfs major in Poa in Chengdu.
依據(jù)成都地區(qū)以草地早熟禾爲(wèi)主躰的草坪襍草的季節(jié)生長發(fā)育節(jié)律，測定了它們在不同地段的種類、結(jié)搆、數(shù)量、季節(jié)更替及其危害。