单项选择题
The characteristic of a lighted cardinal mark may be （）.
A.very quick flashing
B.flashing
C.fixed
D.occulting
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相关考题
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单项选择题
Temperature and moisture characteristics are modified in a warm or cold air mass due to （）.
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 -
单项选择题
Please wireless to let me know （） I am to anchor or to meet pilot．
A.which
B.where
C.what
D.who -
单项选择题
Place names used should be those （）.
A.specified by international authorities
B.specified by national authorities
C.on standard map
D.on the chart or Sailing Directions in use
