The study was designed as a quasi-experiment, taking two natural classes of the first graders in a senior high school as the subjects, experimental class and control class.
研究按照准实验来设计，采用两个高中一年级的自然、平行班级作为研究对象，一个实验班，一个对照班。
2
The assessment results indicate there are quasi cycle motion law of natural water resources renewability of Jin river basin in the time scale in years.
评价结果表明：泾河流域水资源自然再生能力在年内时间尺度上存在明显的准周期运动规律。
3
The object of natural selection is the quasi-species, and the existence of the error threshold places a limit on the genome length that the organisms carry.