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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When a pilot is on board to pilot the vessel the Letter （） must be hoisted．
Insufficient space between the hull and bottom in shallow water will prevent normal screw currents resulting in （）.
Which vessel may show three lights in a vertical line，the top and bottom being red and the middle being white? （）
The transfer procedures for oil products are required to be posted （）.
The pilot said he （）our vessel directly to the berth．
Temperature and moisture characteristics are modified in a warm or cold air mass due to （）.
If the officer on watch is in any doubt as to the pilot’s actions，or intentions，he should （）.
The radiotelephone required by the Vessel Bridge-to-Bridge Radiotelephone Act is for the exclusive use of （）.
From （）the mariner can understand the data of tide．
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（）.