Two type, commonly combination washer , or male cone screw cooperate with female cylindrical screw as Europe standard.
有两种，一般的组合垫圈，或者欧标用圆柱内螺纹配圆锥外螺纹。
The female cone of the male sterile plant can blossom, pollinate and bear seeds normally.
雄性不育株的雌球花发育正常，并能正常开花、授粉和结籽。
The abortive ovules and male flowers in male cone inflorescence and the ovules in female cone inflorescence are originated from an annular meristem which differentiates from the base of each collar.
雄球花序中的不育胚珠和雄球花以及雌球花序中的胚珠均起源于环状总苞基部的分生组织。
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