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

（）is on the panel of radar.

Which wind results from a land mass cooling more quickly at night than an adjacent water area?（）

ECDIS must be able to perform all of the following EXCEPT（）.

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

Full details of all lights and fog signals are shown on（）.

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

Despite the rising importance and great convenience of the gyrocompass,the magnetic compass still retain its importance because of its（）.

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

Which of the following is not an operation mode of AIS?（）