B(yng)iiϵѴ һ
@tٿٿQ~SնiϿ10-15%^20%
Ҫ֥iϵϱϿ10%-25%IB(yng)25%;Ҫ10%ҪÓֻιiϲ˼
ϡ
iϿ5-10%ĸiʺڲιNιǰ졣
Zʳ
СQ㶹iϿ50%^60%
塢(dng)
QӼ~ۡǷѪë۵iϿ4-8%iιѪi~ۿ10%QӼ~۾ֻ5-6%@ϕr(sh)Ҫע}ױ
V|(zh)ϡ
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G
ˮĸƼˮɏˮJˮr(nng)~ټޣӵ@G֭IB(yng)SһռϿ40%