地心地固坐标系
earth-centered earth-fixed(ECEF) coordinate system
ECEF
earth centered earth fixed
earth-centered and earth-fixed(ECEF) coordinate system
ahead thrust
ECEF coordinate system
农村土地经营体制
rural land management system
农地经营
management of agricultural land
农地经营权
management rights of country land
农民土地经营权
peasants’ right of land operation
企业经营经济学
enterprise management economics
山地经营
exploitation of the mountainous regions