污染的器材和地面要用化学药物消毒.Contaminated instruments and floor surfaces should be chemically disinfected.轰吓 、 射杀或者用化学忌避剂可防止鸟类栖息.Perching can be discouraged by scaring, shooting or chemical repellants.过去曾设法用化学变性方法,提高纤维的抗磨损性能.There h...