A.large cumulonimbus (thunderclouds) building up
B.high cirrus clouds gradually changing to cirrostratus and then to altostratus
C.fog caused by the warm air passing over the cooler water
D.low dark clouds accompanied by intermittent rain
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A.very quick flashing
B.flashing
C.fixed
D.occulting
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
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The pilot station （） close west of the end of the breakwater．
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．
When a pilot is on board to pilot the vessel the Letter （） must be hoisted．
Pilot ladder is （） on port side．
The single letter G，sent by an icebreaker to an assisted vessel，means （）.
The iron mike is a(n) （）.
Insufficient space between the hull and bottom in shallow water will prevent normal screw currents resulting in （）.
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 （）.