图中的船舵是什么舵呢？

<p style="margin-top:0;margin-right:0;margin-bottom:0;margin-left:0;text-indent:28px;padding:0 0 0 0 "><span style=";font-family:Calibri;font-size:16px"><span style="font-family:宋体">亲爱的</span></span><span style=";font-family:宋体;font-size:16px">同学们</span><span style=";font-family:Calibri;font-size:16px"><span style="font-family:宋体">们，今天我们了解关于古船船舵的相关知识，智慧的中国人不断的将船舵改进更新，更便于在江河大海中航行。</span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:0;margin-left:0;text-indent:28px;padding:0 0 0 0 "><span style=";font-family:Calibri;font-size:16px"><span style="font-family:宋体"></span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:0;margin-left:0;text-indent:28px;padding:0 0 0 0 "><span style=";font-family:Calibri;font-size:16px"><span style="font-family:宋体">您认为下图中的船舵是什么舵呢？</span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:0;margin-left:0;text-indent:28px;padding:0 0 0 0 "><span style=";font-family:Calibri;font-size:16px"><span style="font-family:宋体"></span></span><br/></p><p><img src="https://mooc-image.nosdn.127.net/b072411f8db74abfb9a513c359601a74.png" class="eduEditor-img" style="width: 458px; height: 269px;"/></p>