The sensitization behavior of special structures such as weld seams reduces the resistance of materials to intergranular......

用一年时间对家养条件下各年龄段非洲黑鸵鸟的行为进行了观察。发现除繁殖行为外不分年龄和地域 ,均有相同的行为。其行为谱是 :觅......