断奶仔猪腹泻,头面水肿,共济失调,取病料接种麦康凯培养基,生长出红色菌落,菌落涂片染色,镜检,革兰氏阴性中等大小球杆菌,该病可能的病原是()
A. 大肠杆菌
B. 沙门氏菌
C. 布鲁氏菌
D. 产气荚膜梭菌
查看答案
If a CO2 fire extinguisher is not readily available, which of the listed fire extinguishers would be best suited to combat a small electrical fire in a switchboard?()
A. Dry chemical
B. Halon
C. Low velocity fog
D. Steam
标准公差从IT01至IT18等级依次升高。
A. 正确
B. 错误