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.
A型流感病毒在温血动物中广泛存在，也是目前导致人类和各种动物流感疾病的主型。
Influenza a virus exists in almost all of homothermal animals and is the prime type leading to infection in humans and animals.
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