This paper gives a brief analysis of Liu Er's life and achievements, dividing his life into six periods, and examines the teacher-student relationship and relative problems.
本文对刘鹗的生平、业绩进行了扼要的述评，将其生平划分为六个时期，并对刘鹗的师承关系和相关问题进行了研究和探讨。
The process of the adventitious root formation in grape cuttings can be divided into six periods.
不定根的形成过程可以分为六个时期。
According to various comprehensions of the authority carrier , I divide the developing history of management authority into six periods , and make a simple critical description to each period .
按照对权威载体这一核心要素的不同理解，将管理思想史上的权威理论分为六个阶段，并对每一阶段进行了简单评述。
According to various comprehensions of the authority carrier , I divide the developing history of management authority into six periods , and make a simple critical description to each period .
按照对权威载体这一核心要素的不同理解，将管理思想史上的权威理论分为六个阶段，并对每一阶段进行了简单评述。
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