A、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 14px">传统形式</span>
B、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 14px">直接解法</span>
C、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 14px">能量形式</span>
D、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 14px">渐进解法</span>
A、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 14px">传统形式</span>
B、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 14px">直接解法</span>
C、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 14px">能量形式</span>
D、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 14px">渐进解法</span>
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