（）is the most widespread type likely to be encountered at sea and is caused by relatively warm air being cooled by flowing over a cooler sea surface.

（）is a type of fog occurring close to the sea surface w...

单项选择题（）is a type of fog occurring close to the sea surface when the air is dry and cold-probably at least 9℃ below the sea surface temperature.

（）forms over land，most frequently during autumn and win...

单项选择题（）forms over land，most frequently during autumn and winter over low-lying land，especially if it is damp and marshy and in valleys on quiet nights with clear skies.

（） blow more or less constantly（except when monsoons pr...

单项选择题（） blow more or less constantly（except when monsoons prevail）throughout all seasons at a mean speed of around 14 knots and are generally strongest in the late winter.