Which of the actions listed should be taken FIRST to control an oil fire in a fuel oil tank?
A. Commence draining that tank as quickly as possible
B. Seal off all vents to that tank
C. Activate the CO2 system to that tank
D. Shut off the steam heating coils
检测PRRS阳性抗体国际上通用且较敏感的血清学方法是()
A. ELISA试验
B. 病毒分离鉴定
C. RT-PCR
D. 补体结合试验
E. 间接免疫突光抗体
Auxiliary machinery includes all mechanical appliances and equipment on board except ()
A. the main engine
B. the boiler
C. the main engines and boilers
新鲜人粪污染了棱水,可能感染
A. 弓形虫
B. 钩虫
C. 蝈虫
D. 鞭虫
E. 溶组织内阿米巴