Air cocks， usually positioned at the （） in a circulating system， is used to get rid of the air in the system.

When turning the engine with turning gear， you should keep the indicator cocks （）. A: attached to the indicators B: opened C: closed D: broke

The starting air system usually has （） to prevent starting if anything is not in order. A: drain cocks B: vent valves C: counteracts D: interlock

Start the turning gear, and with some one hand-operating the cylinder lubricators at regular intervals, and with the indicator cocks （）, and with the control gear in the （）position, give the engine at least one complete turn. A: open；“stop” B: closed；“stop” C: open；“start” D: closed；“start&rdquo

Before engaging the turning gear and turning the diesel engine, which of the following operation should be done except_____ A: open the indicator cocks B: supply some L.O to cylinder liner wall with lubricator C: put the fuel handle in the "stop'" position D: pump up the air bottle

The<br/>indicator cocks are opened, the turning gear engaged and the engine<br/>turned through several complete revolutions, in this way () which<br/>may have collected in the cylinders will be forced out. A: any<br/>fuel oil B: any lube oil C: any water D: any air