A、<span style="font-family: 宋体;font-size: 15px">K</span><span style="font-family: 宋体;font-size: 15px">=1/3100</span></p><p></p>
B、<span style="font-family: 宋体;font-size: 15px">K</span><span style="font-family: 宋体;font-size: 15px">=1/3200</span><span style="font-family: 宋体;font-size: 15px">;</span></p><p></p>
C、<span style="font-family: 宋体;font-size: 15px"></span><img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/ueditor/jsp/upload/image/20161111/1478853990334081419_blob.png" title="36930623598500865" alt="blob.png"/>
查看答案