A、<p><span style="font-size: 10.5pt; font-family: 宋体;">腺嘌呤</span></p>
B、<p><span style="font-size: 10.5pt; font-family: 宋体;">鸟嘌呤</span></p>
C、<p><span style="font-size: 10.5pt; font-family: 宋体;">尿嘧啶</span></p>
D、<p><span style="font-size: 10.5pt; font-family: 宋体;">胞嘧啶</span></p>
E、<p><span style="font-size: 10.5pt; font-family: 宋体;">胸腺嘧啶</span></p>
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