光谱用取样法 methods of sampling: 抽样方法sampling methods: 抽样法; 取样调查computation methods for fixed sampling: 固定抽样的计算方法methods for sampling boiler steem: 锅炉蒸汽的采样方法methods for sampling of feed: 饲料采样方法下载手机词典可随时随地查词查翻译