单项选择题

A.large cumulonimbus (thunderclouds) building upB.high ……

The first indications a mariner will have of the approach of a warm front will be （）.

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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热门试题

单项选择题The characteristic of a lighted cardinal mark may be （）.

A.very quick flashing
B.flashing
C.fixed
D.occulting

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

单项选择题Pilot ladder is （） on port side．

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