为了筛选出适宜武汉及其周边地区种植的紫花苜蓿（Medicago sativ L.）品种,于2013-2015年对来自美国的10个不同秋眠等级的紫花苜蓿进......

Oceans and seas form a large body of water that contains a natural biodiversity.For humans,represents a resource,which m......