单项选择题
Which of the following is operated from the main engine room console on an automated vessel?（）
A.Fire pump and lube oil pump B.Lube oil pump and distilling plant C.Distilling plant and shaft alley door D.Shaft alley door and fixed CO2 release
单项选择题 An un-loader is installed on an air compressor to （）.
单项选择题 After installing a new hydraulic pump in a system, what special attention should be given to the hydraulic system?（）
单项选择题 For safe storage, the maximum allowable temperature to which refrigerant bottles should be exposed is （）.
