http://image.baidu.com/i?ct=503316480&z=3&tn=baiduimagedetail&word=%CA%AE%D7%D6%D0%E5%B0%CB%BF%A5%CD%BC&in=15432&cl=2&cm=1&sc=0&lm=-1&pn=10&rn=1&di=1495631136&ln=55
http://image.baidu.com/i?ct=503316480&z=3&tn=baiduimagedetail&word=%CA%AE%D7%D6%D0%E5%B0%CB%BF%A5%CD%BC&in=4128&cl=2&cm=1&sc=0&lm=-1&pn=0&rn=1&di=2199933136&ln=55
下面这幅最清楚了
http://www.chaozhinan.com/publicimg/article/b/416_20090331120202_5757.jpg
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