简答题First ring in Von Thünen’s Model is ____. A、A forestry ring B、A rotation ring C、A grain-pasture agriculture area D、A free cash cropping ring简答题Which of the following is the process of regional development divided by Rostow? A、The traditional society B、The preconditions for take-off C、The take-off D、The Maturity简答题Which of the following are the cases when centrifugal force occurs ____？ A、Purchase fewer good from outside the region, thereby reducing the cost of trade B、The demand for labor increases C、manufacturers move from other regions to the local regions, so the profits to the local manufactures decline D、Reduce the nominal wages paid to workers, hence labor flows简答题Von Thünen has published the Isolated State. True or False?简答题Economic growth is usually gradually spreading via one or several "growth centers" to other sectors or regions. Therefore, a specific geographic space should be selected as the growth pole to drive the economic development. True or False?简答题October 1984 at a national symposium on national economic geography and territorial planning in Urumqi, Lu Dadao put forward his Pole-Axis Theory and T-shaped Spatial Strategy. True or False？简答题According to growth poles theory,the growth pole is a propulsive business unit (a company, industry)or a set of these units.This type of units combines with the surrounding economic environment True or False?简答题As trade costs decline, the saved trade costs that manufacturers can obtain by choosing a bigger market area, as their production location are reduced. Demand associated with a manufacturer’s relocation from other regions to the local area weakens, followed by the centripetal force ____. A、Increases B、Weaken C、Stays the same D、All above is possible