請點下列連結...
http://tw.class.uschoolnet.com/class/?csid=css000000152601&id=model8&cl=1336801940-8134-497&mode=con&m8k=1336806010-3304-5034
https://www.google.com.tw/search?q=%E5%AE%B6%E5%BA%AD%E6%A8%B9%E7%95%AB%E6%B3%95&newwindow=1&source=lnms&tbm=isch&sa=X&ei=ZgvWUubeO4mnkQX574GgAg&ved=0CAcQ_AUoAQ&biw=1024&bih=621#facrc=_&imgdii=AddpyW9Q35nZ1M%3A%3Bm9KWJE0gURUQwM%3BAddpyW9Q35nZ1M%3A&imgrc=AddpyW9Q35nZ1M%253A%3BWeRhEJemPGuSOM%3Bhttp%253A%252F%252Fweb.npes.ptc.edu.tw%252FschoolT%252Fimages%252F42%252Fclip_image002.jpg%3Bhttp%253A%252F%252Fweb.npes.ptc.edu.tw%252FschoolT%252F7-4-2.htm%3B1058%3B1274