60um=_ nm,50km=_ um

1km = 1 × 10 ^ 3M (km)
1cm = 1 × 10 ^ (- 2) m (CM)
1 mm = 1 × 10 ^ (- 3) m (mm)
1dmm = 1 × 10 ^ (- 4) m (silk rice)
1dmm = 1 × 10 ^ (- 5) m (HM)
1 μ M = 1 × 10 ^ (- 6) m (micron)
1nm = 1 × 10 ^ (- 9) m (nanometer)
1pm = 1 × 10 ^ (- 12) m (Pico meter)
60um=60*1000*10^(-9)m=60000nm
50km=50*1000*10^(-6)m=5*10^（10）um

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