单项选择题 In an oil cooler circulated by sea water, the oil is at a larger pressure the result being that any leak in the cooler will mean a loss of （）.

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.