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單項(xiàng)選擇題

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

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單項(xiàng)選擇題

Please wireless to let me know （） I am to anchor or to meet pilot．

A.which
B.where
C.what
D.who

單項(xiàng)選擇題

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