题目内容
（请给出正确答案）
[主观题]
采用bottom-up方法估算某区域物质M在用量时可采用以下计算 Which of the followingextensively describes the method for estimating the regional in-use stock of a certain substance M in a bottom-up method
A.该区域含有物质M的产品数量和单个产品的物质M含量 The number of products containing substance M multiply by the average content of substance M in an individual product###SXB###B.该区域面积与单位面积中物质M的平均含量的乘积 The area multiply by the average content of substance M per unit of area###SXB###C.该区域人口数量和该地区人均物质M用量的乘积 The population of the region multiply by the average amount of substance M per capita###SXB###D.以上方法都可用 All of the above
答案
以上方法都可用 All of the above
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