简述鱼体消毒的重要性。
营菌（）。 ["不需要“食物”，因为它们可产生自己所需要的物质","需要有机物","需要氮和糖","需要生产因子"]
自给式呼吸器分为（）、（）、和（）三种。 ["A.氧气呼吸器；防尘呼吸器；防毒呼吸器","B.氧气呼吸器；空气呼吸器；化学氧呼吸器","C.防尘呼吸器；空气呼吸器；化学氧呼吸器","D.防毒呼吸器；空气呼吸器；化学氧呼吸器"]
Advise（）your fishing gear． ["you recovery","you recover","you recovering","you recovered"]
Turbocharging system may be designed to operate on either the （） or the constant pressure exhaust system. ["pulse","exhaust","fluctuating","hunting"]
从资金运用的角度看，营运资金是指运用在（）上的资金。
