Proper infection dosage and routes were selected to make the chickens artificially infect avian colibacillosis successfully.选择适宜的攻毒剂量和攻毒途径,诱发淮南麻黄鸡大肠杆菌病.At least one avian disease pathogen has been found.已经发现至少有一种禽病的病原体.B...
Diehards refused to countenance the importance of aircraft.死硬派拒绝承认飞机的重要性.Oh, there are still some diehards such as The wall Street Journal and Gary Hart.当然, 也还是有象《华尔街日报》和加里·哈特这样一些死硬派....