中国主要河流入海泥沙还具有明显的三个阶段变化特征，即分别在1968年和1984年前后发生了突变。

Periodical analysis showed that abrupt change of sediment load happened in 1968 and 1984, which divided the variation process of river sediment load into three stages.

youdao

试验结果统计分析表明：超高产品种克丰4号较其它三个品种具有明显的生物学特征特性，单株小麦的生物产量和粒重相对较低，但单位面积上群体的生物产量和粒重分别提高16.7%和48.2%。

The results showed that the KefengNo. 4 yield was 16.7and 48.2 percent higher than that of other three varieties in yield, due to Kefeng No. 4 with resistance lodging and close planting;

youdao