???′??????·??????1???? ???′??????·??????1?????? ???′??????·??????1?????
???′??????·??????1???????÷??
???????
??????+??????=???·??????I??
??????+??????=???·??????I??
???????+??????=???·??????I??
???·??????I?????
?????????
?????13?
???????
????????——?????????1941-9704?????????——???????·????????????????2.0%??????Ч??——?????Lv1????????????????????????130%??????????????Lv1?????????15%??????????Ч???????????5%???????????Lv1????????????伸?????????50%??
????????????40407???′??澫???????http://austindefensivedrivingonline.com/laycq/