308mm=【 】m=【 】cm=【 】nm急啊~~~~~~

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308mm=【   】m=【   】cm=【   】nm急啊~~~~~~

308mm=【 】m=【 】cm=【 】nm急啊~~~~~~
308mm=【 】m=【 】cm=【 】nm
急啊~~~~~~

308mm=【 】m=【 】cm=【 】nm急啊~~~~~~
0.308m=30.8cm=308000nm

=0.308m=30.8cm=308000nm
绝对没错