问题描述: 1.5mm=___pm,15min=___h,1h___s. 1个回答 分类:综合 2014-11-23 问题解答: 我来补答 1.5mm=1.5×10^9 pm【1mm=1 000 000 000 pm】15min=0.025 h,1h=3600 s 【1h=60min=3600s;1min=60s】 展开全文阅读