單項(xiàng)選擇題

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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單項(xiàng)選擇題

The characteristic of a lighted cardinal mark may be （）.

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

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

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The characteristic of a lighted cardinal mark may be （）.

Temperature and moisture characteristics are modified in a warm or cold air mass due to （）.