5米增加它的1/2后,再减少1/2米,结果是请选择ABCD6O5g7K7A7E-G。6[1I+v5R.b*_;s+]-Z)^*f
A.3(3/4)6[1I+v5R.b*_;s+]-Z)^*f
B.3(1/4)6[1I+v5R.b*_;s+]-Z)^*f
C.5米6[1I+v5R.b*_;s+]-Z)^*f
D.7米6[1I+v5R.b*_;s+]-Z)^*f