南水北调东线工程防止钉螺扩散技术研究Ⅱ水源区保芦沙埋灭螺效果观察
남수북조동선공정방지정라확산기술연구Ⅱ수원구보호사매멸라효과관찰
Technology of preventing Oncomelania snail diffusion in east route of South-to-North Water Diversion Project Ⅱ Effect of sand buried and reed protection on snail control in area of water source
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