A、<span style="font-family: 宋体;font-size: 15px">对中;</span></p><p></p>
B、<span style="font-family: 宋体;font-size: 15px">十字丝的竖丝不铅垂;</span></p><p></p>
C、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/ueditor/jsp/upload/image/20161114/1479101870086051764_blob.png" title="34000298040715284" alt="blob.png"/>
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