合同有效期限自鳋至止，为期壹年。其中至为试用期。

Thee term of contract starts as from to ; totally one year(s). the probation period thereof is as from to .

本文对鲢、鳙锚头鳋的生物学、病后获得免疫以及药物治疗进行了探讨。

The present paper deals with the biology of the parasitic copepod Lernaea poly-morpha and the acquired immunity on the part of the hosts after its infeetion on silver carp and big-head.

本文对鲢、鳙锚头鳋的生物学、病后获得免疫以及药物治疗进行了探讨。

The present paper deals with the biology of the parasitic copepod Lernaea poly-morpha and the acquired immunity on the part of the hosts after its infeetion on silver carp and big-head.