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delivery ratio
auto. 供气比; 充气比气缸供气质量比该气缸容积的大气密度时的质量; 二冲程发动机扫气比
ecol. 输移比
interntl.trade. 交货率
delivery ratio: 6 phrases in 4 subjects
Earth sciences3
Ecology1
Hydrology1
Technology1