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???????????????60??201??70??234??80??253??90??266??100??323???????????60??30??70??40??80??50??90??60??100??70??
???????????ζ?????????????????????????????????????????????75%??????????3/4????????????????????????75%??
?????60??201/(30*4/3)=5??70??234/(40*4/3)=5.85??80??253/(50*4/3)=3.8??90??266/(60*4/3)=3.33??100??323/(70*4/3)=3.46??
?????????????70>60>80>100>90??
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????????????????40407?λ??????????????http://austindefensivedrivingonline.com/shouyou/mhxy/