603603
bacad
cbad
10abcd
11abd
12abc
全对
cbddb
bcad
abd
abc
abcd
bbbaa
c'caa
11acd
12ab
13,14错误
11abc
12ac'd
13,14正确
bcacb
cadb
B2C模式(商消模式) c2c(个人个模式)b2b
CBBBB DBDCB DBBAC CAADD DACD
ABCD ABD ABCD ABD ABD ABCD ABCD ABCD
11121122
BACAD CBAD
ABCD ABD ABC
1 1 1
CBDDB BCAD
ABD ABC ABCD
111
BBBAA CCA
ABCD ACD AB
2 2 1
b
c
a
d
acd
1
2