该文从挂篮荷载计算、施工流程、支座及临时固结施工、挂篮安装及试验、合拢段施工、模板制作安装、钢筋安装、混凝土的浇筑及养生......

Living zygotes of tobacco (Nicotiana Tabacum L.) SR-1 were isolated and cultured in vitro by the microculture technique.......

During early embryogenesis in mammals and higher plants,the maternalto-zygotic transition (MZT) marks the turnover of de......