（）is on the panel of radar.

The company should establish and maintain procedures to control all documents and date which are relevant to（）.

The circulation around a low pressure center in the Northern Hemisphere is（）.

（）is where the crew eat their meals.

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

The helm command PORT TWENTY means（）.

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

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

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

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