短語詞組短語diameter height ratio 徑高比well diameter enlargement ratio 井徑擴(kuò)大率diameter reduction ratio 縮徑比Diameter Thickness Ratio 徑厚比hole diameter enlargement ratio 井徑擴(kuò)大率blade diameter length ratio 葉片徑高比borehole diameter enlargement ratio 井徑擴(kuò)大率length diameter ratio 長(zhǎng)度直徑比;長(zhǎng)徑比lift diameter ratio 升力直徑比 返回 diameter ratio