单项选择题 In （）, hot diesel engine jacket water passes over the stack and heats the sea water passing through the tubes.

单项选择题 When a boiler is operating, the water level in the gauge glass reads （） when the boiler is shut down.

单项选择题 Where an excessive level of contamination is detected an alarm is sounded and diverting valves are operatedThe discharging liquid is then passed to （）.