研究了主型的有关性质，证明了一个素模型存在的充分必要条件。
A necessary and sufficient condition of the existence of prime model is proved.
C70货车是中国的主型铁路货车，其轮—轴失效关系到铁路运输安全。
C70 type freight car is a main kind of operational freight car in China.
我们这些小陶牛的墓主被长眠着一座椭圆型的土坑里。
The owner of our four clay cows would have been laid in an oval pit.
各主优势型对应的时间系数的周期变化主要在2～5年之间。
The time coefficient of each model has a period of 2~5 years.
您是这里穿得最有型的主筦。
您是这里穿得最有型的主筦。
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