（）is halfway between the forward and after perpendiculars and is reference point for vessel construction.

Fog is likely to occur when there is little difference between the dew point and the（）.

Shipboard Emergency Drills must be carried out at least（）on board cargo ship.

According to the relevant regulation, lifeboat should be powered by（）.

When the wave period and the apparent rolling period are the same（）.

It is dangerous for vessels without the operational radar（）the estuary.

（）is the act of allocating space to containers on board of a container ship in the order of the discharge ports.

Bales close to the deckhead should be covered to prevent（）.

Before any loading takes place any signs of the previous cargo should do（）.

Your vessel is docking, but not yet alongside. Which line will be the most useful when maneuvering the vessel alongside the pier?（）.