试谈混凝土面板堆石坝各料区间反滤原则--与<混凝土面板坝工程>编者商榷試談混凝土麵闆堆石壩各料區間反濾原則--與<混凝土麵闆壩工程>編者商榷 시담혼응토면판퇴석패각료구간반려원칙--여<혼응토면판패공정>편자상각 Discussions on the filter principles between different material zones in concrete facing rockfill dam--discussion with the editor of "concrete facing dam engineering"