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bang2001b
2 năm trước
/ Thụ phấn là : A. sự kéo dài ống phấn trong vòi nhụy B. Sự di chuyển của tinh tử trên ống phấn C. sự nảy mầm của hạt phấn trên núm nhụy D. Sự tiếp xúc của hạt phấn với đầu nhụy
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