使用砂轮时应注意哪些安全事项？
主存储器与外围设备之间的信息传送操作称为（）。 ["通道操作","存储管理操作","I\/O操作","输入操作"]
（）belongs to emergency power supplying equipments. ["Accommodation lighting","Windlass","Main sea water pump","Compressor"]
操动机构的正常巡视项目有哪些？
Overspeed of the diesel engine driving an electric generator could cause（）. ["low voltage trip","reverse power trip","damage to windings","excessive exhaust temperature"]
工作许可人应对哪些事项负责？
