The chart below shows the pressure distribution in some parts of China at some time in spring. After reading and analyzing the map, meet the following requirements: (1) Draw ridge lines and groove lin

The chart below shows the pressure distribution in some parts of China at some time in spring. After reading and analyzing the map, meet the following requirements: (1) Draw ridge lines and groove lines in the map. (2) (1) See the figure below (straight line).

(2)B and D are warm fronts, and A and C are cold fronts.

(3) Mongolia-Siberia high, polar continental air mass.

(4) When a cold front crosses the border, there is usually strong wind, thick clouds and rainy and snowy weather.

In the northern hemisphere, the southerly wind blows in front of the trough with updraft, and the northerly wind blows behind the trough with downdraft. Take the AB front line as an example. Line A is a trough line, southwest wind blows in front of the trough, and southwest wind blows from the south, so the warm air mass moves to the cold air mass actively, so line B is a warm front, and northwest wind blows behind trough A, and the cold air mass moves to the warm air mass actively, so A is a cold front. In the picture, the strong high pressure on the mainland is located in Mongolia and Siberia, and the name of the high pressure is Mongolian high pressure. Mongolia and Siberia are located on the mainland, where polar continental air masses prevail. When the front edge of the cold air mass is inserted under the warm air mass, the warm air mass is forced to rise, and the warm air mass cools in the rising process, in which water vapor is easily condensed into clouds and rain. When the cold front passes by, there is usually strong wind, thick clouds and rainy and snowy weather. The cold air mass occupied the original position of the warm air mass, and the temperature dropped, the air pressure rose and the weather improved.