来自郝娜的问题
125CM,=M=MM=NM0.25KM=M=微米1.25H=MIN9000S=MIN=H
125CM,=M=MM=NM
0.25KM=M=微米
1.25H=MIN
9000S=MIN=H
1回答
2020-02-25 22:38
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黄鹍
[1]125CM=1.25M=1250MM=1250000000NM
[2]0.25KM=250M=250000000微米;
[3]1.25*60MIN=75MIN;
[4]9000S/60S=150MIN/60MIN=2.5H
2020-02-25 22:41:58