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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The pilot station （） close west of the end of the breakwater．
Is the pilot boat （） station
Please wireless to let me know （） I am to anchor or to meet pilot．
There shall be two principal （） through the harbor for the passage of vessels of over 60 tons burden．
On no account （）proceed without pilot in this water area．
Place names used should be those （）.
The single letter G，sent by an icebreaker to an assisted vessel，means （）.
Passage through the Suez Canal is operated on a （） system．
Temperature and moisture characteristics are modified in a warm or cold air mass due to （）.
The pilot said he （）our vessel directly to the berth．