This book is suitable for teachers and students of environmental protection colleges, environmental monitoring personnel, etc. This material comes from Changsha Environmental Protection Vocational and Technical College, collected by tomseanlong, and its copyright belongs to the original author. I collect and organize these materials in order to facilitate my own learning and those of environmental protection personnel. Please do not use them for commercial purposes. Otherwise, the legal liability arising therefrom shall be borne by the infringer. Source: Changsha Vocational College of Environmental Protection
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