单选题 When the air reach saturation, ______ may happen.

单选题 Temperature——ranges from -1℃ to 35℃.

单选题 Fog is likely to occur when there is little difference between the dew point and the ______.

单选题 When recording dry and wet bulb temperature, you should always take your ______ to the windward of your ship.

单选题 Advection fog is more commonplace produced in ______.

单选题 Radiation fog, often called ______, forms over land at night in clear conditions.

单选题 When moist air moves over a cooler surface, ______ may occur.

单选题 An instrument useful in predicting fog is the ______.