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【多选题】
茎尖区别于根尖的构造特点是( )A.
无类似于根冠的构造
B.
由生长区
C.
具有
D.
具有腋芽原基
E.
具有气孔和
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A.
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B.
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C.
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D.
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A.
a short story
B.
a news report
C.
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D.
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