请参考A5参数设置http://wenku.baidu.com/link?url=h8tO-r3UkFevfOOT9axLXidpKjgWQuPMwBlzBWU6niXnG3Y1g4n_BWdoSfsT-CABj5_XEoBvm_duJSsQx9wB-MmeiRSBXhxRUrZYKdOFX8e
