ǰλã߿WW > I(y) >
ƸҪ
ᘌǻt(y)WI(y)ƸI(y)oĹYh࣬ռ89%;Ҫռ35%;ƌWvҪ࣬ռ50%
͘I(y)
ǻt(y)WI(y)WI(y)ɿǻt(y)ľ͘I(y)I^ȿڴt(y)Ժ¿ǻƹҲ˽_O\ԺP沿ݡI(y)ct(y)WR`PĹ1)t(y)
mψʲôW
ŮĿƌI(y)͘I(y)ǰ
]xʲôI(y)
Ůt(y)WI(y)
߿־ԸI(y)xָϣ