单项选择题
A.very quick flashing B.flashing C.fixed D.occulting
Temperature and moisture characteristics are modified i...
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
Please wireless to let me know （） I am to anchor or to ...
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
Place names used should be those （）.A.specified by inte...
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
