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中间平行线

倍长中线法

<div class="opr-recommends-merge-morelists">
                        
        <div class="c-row opr-recommends-merge-margin-top-ll">
            <div class="c-span2  opr-recommends-merge-item-new " data-click="{'rsv_re_ename':'直线束','rsv_re_uri':'56dec0405ed24c73b3e23f6a135f961e'}">
                                                                            <div class="opr-recommends-merge-p-new">
                <a target="_blank" class="c-img c-img2 c-img-s c-img-radius-large opr-recommends-new-vertical" href="/s?tn=vsearch&wd=%E7%9B%B4%E7%BA%BF%E6%9D%9F&usm=1&ie=utf-8&rsv_cq=&rsv_dl=0_right_recommends_merge_21102&rsv_pq=fdee2172005b7dcd&oq=%E8%AE%A4%E8%AF%86%E7%BA%BF%E6%AE%B5&rsv_t=ac6al9oCisPbCpXRg%2BEHkEkBCW5jtcchoRMMcExPlg3oUBwWCwBDGRlqyb8%2F1Q&euri=56dec0405ed24c73b3e23f6a135f961e">
                    <span class="opr-recommends-img-border-span c-img-radius-large"></span>
                    <img 
                        class="c-img c-img2 c-img-radius-large opr-recommends-merge-img"
                                                    data-img="https://t11.baidu.com/it/u=178891492,2302431870&fm=58"
                                            />
                </a>
                <a class="opr-recommends-merge-mask-new c-img-radius-large" target="_blank" href="/s?tn=vsearch&wd=%E7%9B%B4%E7%BA%BF%E6%9D%9F&usm=1&ie=utf-8&rsv_cq=&rsv_dl=0_right_recommends_merge_21102&rsv_pq=fdee2172005b7dcd&oq=%E8%AE%A4%E8%AF%86%E7%BA%BF%E6%AE%B5&rsv_t=19e6K95fwVKqjs5HO7Kxh73F9SkEK2IQ6C2WanODcWFhu0WhDxtUmf159quZRQ&euri=56dec0405ed24c73b3e23f6a135f961e"></a>                            </div>
            <div class="opr-recommends-merge-img-titleline-height"><a target="_blank" class="c-font-medium inc_rs_a" title="直线束" href="/s?tn=vsearch&wd=%E7%9B%B4%E7%BA%BF%E6%9D%9F&usm=1&ie=utf-8&rsv_cq=&rsv_dl=0_right_recommends_merge_21102&rsv_pq=fdee2172005b7dcd&oq=%E8%AE%A4%E8%AF%86%E7%BA%BF%E6%AE%B5&rsv_t=7677Pc42gERxkCEUHxCfvNWvJFPRnkl4hG3vF0x7msNePQma1cl9fQ%2F%2FJPdjGQ&euri=56dec0405ed24c73b3e23f6a135f961e">直线束</a></div>
                                                        </div>

<div class="c-span2  opr-recommends-merge-item-new " data-click="{'rsv_re_ename':'共线点','rsv_re_uri':'9e6912d538ec44a0b9e62efda45b0e46'}">
                                                                            <div class="opr-recommends-merge-p-new">
                <a target="_blank" class="c-img c-img2 c-img-s c-img-radius-large opr-recommends-new-vertical" href="/s?tn=vsearch&wd=%E5%85%B1%E7%BA%BF%E7%82%B9&usm=1&ie=utf-8&rsv_cq=&rsv_dl=0_right_recommends_merge_21102&rsv_pq=fdee2172005b7dcd&oq=%E8%AE%A4%E8%AF%86%E7%BA%BF%E6%AE%B5&rsv_t=4992VEzJ57pfrTM%2BQmpXiSEwfFklOHbAPXPU7eyaOqcaZ9CalYzdRr%2BTvkvbGg&euri=9e6912d538ec44a0b9e62efda45b0e46">
                    <span class="opr-recommends-img-border-span c-img-radius-large"></span>
                    <img 
                        class="c-img c-img2 c-img-radius-large opr-recommends-merge-img"
                                                    data-img="https://t10.baidu.com/it/u=2415880407,606455214&fm=58"
                                            />
                </a>
                <a class="opr-recommends-merge-mask-new c-img-radius-large" target="_blank" href="/s?tn=vsearch&wd=%E5%85%B1%E7%BA%BF%E7%82%B9&usm=1&ie=utf-8&rsv_cq=&rsv_dl=0_right_recommends_merge_21102&rsv_pq=fdee2172005b7dcd&oq=%E8%AE%A4%E8%AF%86%E7%BA%BF%E6%AE%B5&rsv_t=2cb4Hm%2B48nEP4vEVpYKerEuJpuO8GF%2FKCPeXseRo1QbmK3JGD4sx7ifS8MLUCA&euri=9e6912d538ec44a0b9e62efda45b0e46"></a>                            </div>
            <div class="opr-recommends-merge-img-titleline-height"><a target="_blank" class="c-font-medium inc_rs_a" title="共线点" href="/s?tn=vsearch&wd=%E5%85%B1%E7%BA%BF%E7%82%B9&usm=1&ie=utf-8&rsv_cq=&rsv_dl=0_right_recommends_merge_21102&rsv_pq=fdee2172005b7dcd&oq=%E8%AE%A4%E8%AF%86%E7%BA%BF%E6%AE%B5&rsv_t=6e48lUd9eXWg6CD21j9HCjHfQfbJWalDhMe%2FKKRtKoVntYmRGVnW1QaopGjn0A&euri=9e6912d538ec44a0b9e62efda45b0e46">共线点</a></div>
                                                        </div>

<div class="c-span2  c-span-last-s opr-recommends-merge-item-new " data-click="{'rsv_re_ename':'切线','rsv_re_uri':'27e7cf4e70344a70b5fe31bc0d952291'}">
                                                                            <div class="opr-recommends-merge-p-new">
                <a target="_blank" class="c-img c-img2 c-img-s c-img-radius-large opr-recommends-new-vertical" href="/s?tn=vsearch&wd=%E5%88%87%E7%BA%BF&usm=1&ie=utf-8&rsv_cq=&rsv_dl=0_right_recommends_merge_21102&rsv_pq=fdee2172005b7dcd&oq=%E8%AE%A4%E8%AF%86%E7%BA%BF%E6%AE%B5&rsv_t=b53bukGTKid7WeFtwWA%2BMNKXajuS7%2FVeoFrwrvgtEiVVkEA0lyhOv3UJwp%2FzTw&euri=27e7cf4e70344a70b5fe31bc0d952291">
                    <span class="opr-recommends-img-border-span c-img-radius-large"></span>
                    <img 
                        class="c-img c-img2 c-img-radius-large opr-recommends-merge-img"
                                                    data-img="https://t12.baidu.com/it/u=3787673045,526132009&fm=58"
                                            />
                </a>
                <a class="opr-recommends-merge-mask-new c-img-radius-large" target="_blank" href="/s?tn=vsearch&wd=%E5%88%87%E7%BA%BF&usm=1&ie=utf-8&rsv_cq=&rsv_dl=0_right_recommends_merge_21102&rsv_pq=fdee2172005b7dcd&oq=%E8%AE%A4%E8%AF%86%E7%BA%BF%E6%AE%B5&rsv_t=540549098%2F4oojfEzSFSX7tutQzrbVewe%2Buhuvr3C82p5X2Id%2BDJ7ODK7g%2FWFw&euri=27e7cf4e70344a70b5fe31bc0d952291"></a>                            </div>
            <div class="opr-recommends-merge-img-titleline-height"><a target="_blank" class="c-font-medium inc_rs_a" title="切线" href="/s?tn=vsearch&wd=%E5%88%87%E7%BA%BF&usm=1&ie=utf-8&rsv_cq=&rsv_dl=0_right_recommends_merge_21102&rsv_pq=fdee2172005b7dcd&oq=%E8%AE%A4%E8%AF%86%E7%BA%BF%E6%AE%B5&rsv_t=6824ZrYIbVFNGUTLuCz%2FQ9U5KqUCKZu02FIvUzEf0APVNOJ5tB%2FxbwLTXKhUrA&euri=27e7cf4e70344a70b5fe31bc0d952291">切线</a></div>
                                                        </div>

<div class="c-span2  c-span-last opr-recommends-merge-lastspan opr-recommends-merge-item-new " data-click="{'rsv_re_ename':'点划线','rsv_re_uri':'88917fd040d34138b8b612527e5e6680'}">
                                                                            <div class="opr-recommends-merge-p-new">
                <a target="_blank" class="c-img c-img2 c-img-s c-img-radius-large opr-recommends-new-vertical" href="/s?tn=vsearch&wd=%E7%82%B9%E5%88%92%E7%BA%BF&usm=1&ie=utf-8&rsv_cq=&rsv_dl=0_right_recommends_merge_21102&rsv_pq=fdee2172005b7dcd&oq=%E8%AE%A4%E8%AF%86%E7%BA%BF%E6%AE%B5&rsv_t=51ba9dyR82agIjv6jPiA%2FUUkWaUkz4c7JkCdXyWfG2oGbp1FNHBLCyJOuth81g&euri=88917fd040d34138b8b612527e5e6680">
                    <span class="opr-recommends-img-border-span c-img-radius-large"></span>
                    <img 
                        class="c-img c-img2 c-img-radius-large opr-recommends-merge-img"
                                                    data-img="https://t12.baidu.com/it/u=4091859440,536965589&fm=58"
                                            />
                </a>
                <a class="opr-recommends-merge-mask-new c-img-radius-large" target="_blank" href="/s?tn=vsearch&wd=%E7%82%B9%E5%88%92%E7%BA%BF&usm=1&ie=utf-8&rsv_cq=&rsv_dl=0_right_recommends_merge_21102&rsv_pq=fdee2172005b7dcd&oq=%E8%AE%A4%E8%AF%86%E7%BA%BF%E6%AE%B5&rsv_t=0e5ei1RZvTGgqN2ZyYY8EW322Y5PjIVc7DbYvS%2BVRPRJ34tW%2Bi8ZDj4tNPRX8A&euri=88917fd040d34138b8b612527e5e6680"></a>                            </div>
            <div class="opr-recommends-merge-img-titleline-height"><a target="_blank" class="c-font-medium inc_rs_a" title="点划线" href="/s?tn=vsearch&wd=%E7%82%B9%E5%88%92%E7%BA%BF&usm=1&ie=utf-8&rsv_cq=&rsv_dl=0_right_recommends_merge_21102&rsv_pq=fdee2172005b7dcd&oq=%E8%AE%A4%E8%AF%86%E7%BA%BF%E6%AE%B5&rsv_t=e2e7lLPjvl3nmb5ET%2BHvH0fiZ0v6d7bpikRSnrooBxMZXAsSddcyjZONwaLeYQ&euri=88917fd040d34138b8b612527e5e6680">点划线</a></div>
                                                        </div>

</div>
     
        </div>

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