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

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

The dew point temperature is（）.

The loading of the ship must be done in accordance with（）.

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

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

When steering by autopilot,how often should the steering be checked?（）

Which of the following shall not the officers in charge of the navigational watch do?（）

（）is on the panel of radar.

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