一、问题的提出黄河是我国第二大河,但通航条件较差,特别是中游的晋陕峡谷段,由于有壶口天险作梗,只能局部通行木帆船或机动木帆船。壶口瀑布是国家一级风景区,水雾弥漫,景观壮丽。它的枯水落差有6层楼房那么高, First, the issue raised The Yellow River is the second largest river in our country, but the navigation conditions are poor, especially in the middle reaches of the Shanxi-Shaanxi Gorge section, due to a natural hazard, can only partially pass wooden sailing or mooring sailing. Hukou Waterfall is a national scenic spot, filled with water and fog, magnificent landscape. It’s low water level 6-storey building so high,