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用叶中含梗测定仪和烟梗筛测定叶中含梗率，下列操作时间正确的有：（)。A.3分钟B.4分钟C.5分钟D.6
提问人：最需找题发布时间：1970-01-01
用叶中含梗测定仪和烟梗筛测定叶中含梗率，下列操作时间正确的有：()。
A.3分钟
B.4分钟
C.5分钟
D.6分钟
此题为多项选择题。请帮忙给出正确答案和分析，谢谢！
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