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
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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
A.the vessel
B.shall not vessel
C.the vessel should
D.should vessel
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Which vessel may show three lights in a vertical line，the top and bottom being red and the middle being white? （）
From （）the mariner can understand the data of tide．
The pilot is on board,（） ?
The characteristic of a lighted cardinal mark may be （）.
When a tug is pulling on a hawser at right angles to the ship，and the pilot wants to come ahead or astern on the ship’s engine，care must be taken that the pilot（）.
Please wireless to let me know （） I am to anchor or to meet pilot．
Place names used should be those （）.
When a pilot is on board to pilot the vessel the Letter （） must be hoisted．
Passage through the Suez Canal is operated on a （） system．
There shall be two principal （） through the harbor for the passage of vessels of over 60 tons burden．