A、<span style="font-size:16px;font-family: 宋体">2.0</span><span style="font-size:16px;font-family:宋体">级</span>
B、<span style="font-size:16px;font-family: 宋体">1.5</span><span style="font-size:16px;font-family:宋体">级</span>
C、<span style="font-size:16px;font-family: 宋体">2.5</span><span style="font-size:16px;font-family:宋体">级</span>
D、<span style="font-size:16px;font-family: 宋体">4.0</span><span style="font-size:16px;font-family:宋体">级</span>
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