1、

Moreover, the earth-rock backfill of head conduit can recover early plant cover, and the layout is fit for terrain where topographical falling gradient is less than 20 degrees.

同时,回填管回填土石后,能够恢复原来植被,保护生态环境,且较适于地形坡度小于20°地面布置。

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2、

Since Lancang river belongs to the typical mountainous rivers. The waterway equipped with rapid flow, large falling gradient and many bends.

澜沧江属于典型的山区河流,航道普遍存在着水流急、比降大、弯道多的特性,这些严重地威胁着船舶航行的安全。

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3、

It was discovered that IQ fastigium age was before 7 years and there was a falling gradient in IQ between 8-10. As a conception of "warning age" in IDD area and that of "key age" for prevention and treatment were established.

由于发现IQ高峰年龄在7岁以前及8~10岁时间有个IQ跌梯现象,故提出缺碘地区的警界年龄、防治的关键年龄概念。

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