The traditional mode of transportation in northern China is

(1) The annual precipitation in the north of Qinling-Huaihe River is generally less than 800 mm, and the temperature in winter is generally less than 0℃. Therefore, the top slopes of traditional houses in the north are generally smaller and the walls are thicker.

(2) The transportation modes in the northern region are mainly roads and railways, so the transportation in the northern region is mainly land;

(3) From the climatic data map of North China, it can be seen that the temperature in the North China Plain rises rapidly in spring (3-5 days), but the precipitation is less; At this time, it is spring drought;

(4) Facing the early spring in North China, water conservancy projects can be built, which can adjust the temporal and spatial distribution of water-saving resources to a certain extent. Saving water, using water scientifically, protecting water resources and preventing water pollution are effective ways to solve the water shortage problem.

So the answer is: (1) 800; Less than; Small; (2) land; (3) The temperature rises rapidly, but the precipitation is less;

(4) Saving water, using water scientifically, protecting water resources and preventing water pollution are effective ways to solve the water shortage problem.