农友0564
农友0564
农友0564
2019-12-27 11:49
明白
科技前沿
人工授精和试管婴儿是一回事吗?
很多人常常把人工授精和试管婴儿混为一谈,其实,这两种常用的辅助生殖方法,有着本质的区别。 人工授精是指收集男方的精液,经过处理后,由医生将男方精子注入女方生殖器官内达到受孕目的的一种技术,目前多采用宫腔内人工授精技术。符合的条件是女方有排卵、子宫正常、至少一侧输卵管通畅,男方的精液经
农友0564
2019-12-27 11:48
yes
Agricultural science and education
Pollution free cultivation of peanut
Crop rotation According to the investigation, the population density of grubs decreased by 85.8% and the yield per mu increased by 50-75kg, whic
农友0564
2019-12-27 11:46
oh my god
Agricultural science and education
Quality infrastructure investment benefits both public, private sectors
Recent evidence from the IMF, mainly from OECD countries, provides evidence for these effects. First, a 1% increase in public infrastructure in
