A、<span style="font-family: 宋体; font-size: 19px;">追溯法</span>
B、<span style="font-family: 宋体; font-size: 19px;">直接法</span>
C、<span style="font-family: 宋体; font-size: 19px;">抽查法</span><span style="font-family: 宋体; font-size: 19px;"> </span>
D、<span style="font-family: 宋体; font-size: 19px;">综合法</span>