This paper puts forward a model for the appraisal of hazard degree of pollution origins in oilfield development which combines fault tree analysis and gray connection degree analysis.
针对油田开发污染源存在危险度，提出一种将灰关联度分析与故障树分析相结合的危险度评价模型。
But it is weathering because of poorly kept and hidden in the tree hole too many years. So it needs the authoritative appraisal and to be kept by professional.
但因保管不力，多年藏于千年古树洞，已现风化，亟需权威专家鉴定，交由专业人员收藏保管。
The comprehensive appraisal to urban greening tree species is always a problem troubled botanical garden workers.
城市绿化树种的综合评价，一直以来都是困扰园林工作者的难题。
The comprehensive appraisal to urban greening tree species is always a problem troubled botanical garden workers.
城市绿化树种的综合评价，一直以来都是困扰园林工作者的难题。
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