A.switch on
B.switch off
C.close
D.open
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A.invisible
B.it is invisible
C.isn't visible
D.unvisible
A.repairing
B.to repair
C.repairs
D.have repaired
A.tide is falling from high water to low water
B.tide is rising from low water to high water
C.tide is reaching to a highest level
D.tide is reaching to a lowest level
A.is stayed
B.is situated
C.is placed
D.is located
A.the radio apparatus fitted on the portside
B.the radio with a portable equipment
C.the radio equipment which is easily movable
D.the portable radio with some apparatus
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（）is where the crew eat their meals.
The dew point temperature is（）.
When steering by autopilot,how often should the steering be checked?（）
（）is on the panel of radar.
Manoeuvring information can not be obtained from（）.
When the wave period and the apparent rolling period are the same（）.
The loading of the ship must be done in accordance with（）.
How long are you prohibited to consume alcohol prior to serving as a member of a watch?（）
Which of the following shall not the officers in charge of the navigational watch do?（）
The company should establish and maintain procedures to control all documents and date which are relevant to（）.