词汇	factional sampling
释义	factional sampling 分级取样
随便看	contribution analysis contribution application contribution approach contribution approach to pricing contribution-based contribution behavior of authors contribution box contribution by cash contribution by inferior government contribution by paritcipants contribution by participants contribution by real estate contribution by segment contribution by the yunnanese contribution carryover contribution charge contribution clause contribution coefficient contribution collection contribution compensation contribution costing contribution culture contribution day contribution degree contribution degree of investment