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....
He can be intransigent and pig-headed at times.他有时候会很固执, 寸步不让。He can be intransigent and pig - headed at times.他有时候会很固执,寸步不让.The worry is that the radicals will grow more intransigent.现在人们担忧激进分子会变得更加不妥协。He can be intrans...