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双受精作用
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双受精作用
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植物生物学
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double fertilization
双受精作用
雄配子体形成的两个精子,一个与卵细胞融合形成二倍体的合子,另一个与中央细胞的极核融合形成初生胚乳核的现象。
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tubular air preheater
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tubular joint classification
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