1.5mm=___pm,15min=___h,1h___s.
问题描述：
1.5mm=___pm,15min=___h,1h___s.
答
1.5mm=_1500000__pm,15min=_0.25__h,1h=_3600__s.
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】