A.very quick flashing
B.flashing
C.fixed
D.occulting
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A.pressure changes in the air mass
B.movement of the air mass
C.the heterogeneous nature of the air mass
D.upper level atmospheric changes
A.which
B.where
C.what
D.who
A.specified by international authorities
B.specified by national authorities
C.on standard map
D.on the chart or Sailing Directions in use
A.equipped
B.rigged
C.put on
D.put off
A.convey
B.convoy
C.escort
D.conform
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The first indications a mariner will have of the approach of a warm front will be （）.
When the movement of engine is no longer required the pilot usually gives the order like this（） .
Place names used should be those （）.
Please wireless to let me know （） I am to anchor or to meet pilot．
THE SPEED OF A VESSEL ADJUSTED TO THAT OF A PILOT BOAT AT WHICH THE PILOT CAN SAFELY EMBARK is （）.
Pilot ladder is （） on port side．
From （）the mariner can understand the data of tide．
Insufficient space between the hull and bottom in shallow water will prevent normal screw currents resulting in （）.
The single letter G，sent by an icebreaker to an assisted vessel，means （）.
The characteristic of a lighted cardinal mark may be （）.