资源保证年限可表达为()The service year of a mineral resource can be estimated by()
A、资源年开采量与资源储量之比 The ratio of annual exploitation to the resource reserved
B、资源储量与资源年开采量之比 The ratio of natural resources reserved to the annual exploitation
C、自然资源储量与废物资源量之比 The ratio of natural resources reserved to the secondary resources
D、废物资源量与自然资源储量之比 The ratio of secondary resources to the natural resources reserved