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

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单项选择题

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

单项选择题

A.specified by international authorities
B.specified by national authorities
C.on standard map
D.on the chart or Sailing Directions in use

单项选择题

A.equipped
B.rigged
C.put on
D.put off