（）业务可以进行业务撤销。 ["农信银通存","农信银通兑","存款冲销","农信银电子汇兑"]
A vessel brought alongside should be fended off the towing vessel by（）. ["crew members using their arms","crew members using the strong muscles of their legs","fenders","No fending is necessary due to the rugged construction of most towing vessel"]
During compressors running the accumulated moisture in the separators must be （）. ["drained off","collected","sent to the crankcases","separated with oil"]
简述病症类型的菌脓（溢脓）。
为什么发霉的饲料不能喂鱼？
为什么低温阀门容易发生卡死扳不动的现象。如何解决？
