Charging is the filling of the engine cylinder with a supply or charge of fresh air （） compression.

（） provides the head or pressure to supply the domestic water where required.

The load on the crosshead pin is always （）, so it is the （）half of the bearing which is subject to wear.

保持安全值班的目的包括：（） Ⅰ、避免船舶发生碰撞事故Ⅱ、避免船舶发生火灾Ⅲ、避免船舶污染环境

Just after stopping the engine while the oil is still circulating.Check that uniform oil jets appear from all the oil outlet grooves in the crosshead bearing lower shell and the guide shoes.The oil flow from （） must be compared from unit; there should be a similarity in the flow patterns.

船长应负责保管的船舶安全管理方面的证书有（）。 Ⅰ．符合证明； Ⅱ．符合证明的副本； Ⅲ．船舶安全管理证书； Ⅳ．船舶安全管理证书的副本。

The ability of an oil to separate cleanly from an oil and water mixture is referred to as its （）.

Oil is supplied to the cylinder wall and （） by means of mechanical lubricators.

Oil is supplied to the crosshead using a swinging arm or a （） and is sometimes boosted in pressure to and efficient lubrication.

The cleaned heated oil, after passing through the centrifuges, is to be pumped to a （）.

What is it called when it is possible to ignite the vapour above the oil?（）

In a typical fuel oil system, the oil is stored in tanks in the double bottom from which it is pumped to （） and heated.