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1.5mm=___pm,15min=___h,1h___s.
人气:317 ℃ 时间:2020-02-27 18:06:05
解答
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】
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