小孢子离体培养的最佳发育时期是单核期；
The best development period for microspore culture is monokaryotic stage;
为了培养出一位合格的管理人员，管培生培训期从半年到五年不等。
To qualify a candidate's training period may range from six months to five years.
为了培养出一位合格的管理人员，管培生培训期从半年到五年不等。
To qualify a candidate's training period may range from six months to five years.
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