Read the following materials and answer the relevant questions. Material 1: as shown in figure 1 material 2: as shown in figure 2( 1). In the case of air pressure as shown in Figure 1, the value of isobar A is _ _ _

① Wind direction judgment: first draw the horizontal pressure gradient force, with the arrow perpendicular to the isobar and pointing to the low pressure direction; Then, according to the deflection law of the horizontal motion of the object, the northern hemisphere leans to the right, forming a northerly wind.

The land will be affected by cold high pressure, the air pressure will rise, the temperature will drop, and the weather will turn fine.

According to the change of the sea-land pressure center in different seasons in the northern hemisphere, when the weather system disappears, it is summer in the northern hemisphere and winter in the southern hemisphere; The southwest corner of Australia has a Mediterranean climate, which is controlled by the westerlies in winter.

(2) According to the map reading analysis, the A-B-B-C line is located in the middle latitude of northern China, extending from east to west, and the A-B line is obviously influenced by the west wind. The mountain pass at the western end is conducive to the depth of the westerly airflow, forming precipitation (topographic precipitation) on the windward slope of the mountain, and the water vapor content gradually decreases from west to east; The B-C line is close to the eastern coast of China, mainly influenced by the southeast monsoon (summer monsoon), and the water vapor from the Pacific Ocean gradually decreases from the coast to the inland (from east to west).

(3) Reading the landscape in Figure 2, we can see that this landscape is wind mushroom, which is mainly formed by wind, and should be distributed in areas with dry climate and strong wind. Compare figure 1, ③, and meet this condition. When viewing this kind of landscape, in order to obtain a specific aesthetic feeling, we should choose an appropriate distance and angle.

So the answer is:

(1) 10 12.5 The pressure of the northwest wind (northerly wind) increases, the temperature decreases, and the weather turns fine? westerlies

(2) From A to B, the precipitation is mainly influenced by the westerly airflow, and the mountain pass at the western end is conducive to the deepening of the westerly airflow, forming precipitation (topographic precipitation) on the windward slope of the mountain, and the water vapor content gradually decreases from west to east; From C to B, it is mainly influenced by the southeast monsoon (summer monsoon). Due to the difference between land and sea (different distance from the sea), the water vapor from the Pacific Ocean gradually decreases from the coast to the inland (from east to west).

(3)③ Select the viewing position (distance or angle or viewing point)