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

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

The ISM code is part of（）.

The dew point temperature is（）.

The helm command PORT TWENTY means（）.

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

Where would you find information about the time of high tide at a specific location on a particular day of the year?（）

Which of the following is not a form of precipitation?（）

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

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