<style type="text/css"> body { -moz-user-select : none; -webkit-user-select: none; } </style> <script type="text/javascript"> function iEsc(){ return false; } function iRec(){ return true; } function DisableKeys() { if(event.ctrlKey || event.shiftKey || event.altKey) { window.event.returnValue=false; iEsc();} } document.ondragstart=iEsc; document.onkeydown=DisableKeys; document.oncontextmenu=iEsc; if (typeof document.onselectstart !="undefined") document.onselectstart=iEsc; else{ document.onmousedown=iEsc; document.onmouseup=iRec; } function DisableRightClick(qsyzDOTnet){ if (window.Event){ if (qsyzDOTnet.which == 2 || qsyzDOTnet.which == 3) iEsc();} else if (event.button == 2 || event.button == 3){ event.cancelBubble = true event.returnValue = false; iEsc();} } </script> <center><iframe allowfullscreen="" class="" frameborder="0" height="360" src="https://www.youtube.com/embed/n6QwCBulaJM?wmode=transparent" width="640"></iframe></center> <center style="text-align: left;"><span style="font-size:18px">曲線進退的後退部分,多數的口訣中都會有看到後視鏡的某個安全島凸點消失,換看另一邊後視鏡,然後等著車身與管線分開,</span></center> <center style="text-align: left;"><span style="font-size:18px">為什麼是這樣呢?</span></center> <center style="text-align: left;"><span style="font-size:18px">其實,在做倒退曲線進退時,就是兩個重要的山峰凸點,</span></center> <center style="text-align: left;"><span style="font-size:18px">然後是兩次的鐘擺運動,</span></center> <center style="text-align: left;"><span style="font-size:18px">只要發生鐘擺運動,</span></center> <center style="text-align: left;"><span style="font-size:18px">就是兩個後視鏡的平行延伸線,</span></center> <center style="text-align: left;"><span style="font-size:18px">然後就是三個階段,</span></center> <center style="text-align: left;"><span style="font-size:18px">從某一邊後視鏡中看得到的點,</span></center> <center style="text-align: left;"><span style="font-size:18px">從看得到==>消失==>從另一邊後視鏡出現。</span></center>