正常人行走时的步长大约是请选择ABCD._)a*m1m)B:[+i1|0b'K/j;{:})l(s6Q'n)T
A.0.5 cm1|0b'K/j;{:})l(s6Q'n)T
B.5 m1|0b'K/j;{:})l(s6Q'n)T
C.50 cm1|0b'K/j;{:})l(s6Q'n)T
D.50 m1|0b'K/j;{:})l(s6Q'n)T