In a central cooling system, used in some modem ships, sea water is supplied to cool （）which will circulate to other individual cooler, greatly reducing the corrosion problems.

In a （） engine the charge of air in the cylinder before...

单项选择题In a （） engine the charge of air in the cylinder before compression commences is above atmospheric pressure.

If there is water in fuel oil, the revolution of the en...

单项选择题If there is water in fuel oil, the revolution of the engine will （）.

If the sump（）were to rise this would indicate water lea...

单项选择题If the sump（）were to rise this would indicate water leakage into the oil an d an investigation into the cause must be made.