??????? ????? ????? ??? ????????

???? ??? ?????? ??????? ?????? ?????? ????? ????????? ???????? ????? ?????? ?????? ??????? (SI Units) ??????? ????????? ??????? ?????? ???????? ???????? ??????? ?????? ?????????? ???????? ????????.

????? ??? ??????? ???????

• ??????? ???????： 1 ???????(km) = 0.621 ???(mile) | 1 ???(m) = 3.281 ???(ft)
• ??????? ??????： 1 ???????(nm) = 10 ????(?) | 1 ??????(mm) = 1,000 ??????(μm)
• ???? ??????????： 1 ??? ????(n mile) = 1.852 ???????(km) | 1 ?????(yd) = 0.9144 ???(m)

??????? ????????

1. ????? ?????： ???? ????????? ?? ????? ????????? ??? ??????? ???????? ??? ?? ??? ??????? ???????? ??? ??? ?????? ????? ???? ???.
2. ?????? ?? ????? ???????： ????? ????? ???? ????? ?????? ??? ?????? ??? ????? ??????.
3. ????? ????????????： ????? ?????? ?????? ???? ??????? ???????? ?????????? ?????? ?? ????????.

??????

????? ????? ??????? ?? 6 ???? ?????? ??? ??????? ??? ???????? ??? ???????? ??????? ????????? ????????? (??? ??????? ????????????)? ????? ???????? ??? ??????? ??????? ???????.