绒毛蛛猴是美洲最大的灵长类动物。The woolly spider monkey is the largest primate in the Americas.美洲印第安人在举行仪式时用到各种羽毛。Feathers of various kinds are used by Native Americans for ceremonial purposes.美洲驼既不会咬人也不会踢人。Llamas won't bite or ki...
The enamel surface microhardness was measured by a Leitzs microhardness tester.采用维氏显微硬度仪测定经饮料浸泡后牙釉质表面显微硬度的变化.The microstructure and microhardness of ths laser nulted Fe - Sb alloys were studied.研究了激光表面熔化Fe-Sb合金的显微组织和显微硬度...