(1/2)ҳ
ƵĽ̨ʦǻȻǶԿѧǻ۵̾һЦ˵
һš³һȦһʻУǴ̫ľϲⷢ֡
һ·Ǵһͨδ֪Ĵţÿһ·ֶǶ֪һ
˵ǰѧͨоԤ⣬ΪĺֲͣҲΪȣԼÿĺ 0.1 - 0.3֮䡣
ȻһšصȽԲͬϸ¼ǵϡ
һЩײӸУĺȻߴÿ 1ϣҷֲֳԵľۼ
һְʾܴѧ̣ijЩݻʷͿռ价þҪ塣
ٱ˵ĸߵصѧǴǰе̽ݺģԤ⣬ƲʯɷӦбΪΪԪصĺԽϵ͡
ȻһšЯĸ߾ȹǶԸõϸ֣ʯɷֱԤҪӵöࡣ
˴бң൱ĸþĿЩγɻ֮ǰ˽ݻ۴һIJ졣
ɨһ̨µʦǣȻˣڶķУǾȵط֣ijЩеԪغԶԤڡ
ѧ֮ǰԤ⣬һԪصĺܽΪ 1%- 2%ʵʼʾԪغߴ 5%
һֿܻıǶγɹʷֲݻ⣬ҲγɳھһЩΪҺĵ¼Ԫطֲ쳣
ĵʹ죬ѧǸݶңй۲ƲԼ¿Ǻ 50 - 70ǧ֮䣬ҽΪȡ
һšʻУЯĵ̽Ƕڲ˶̽⡣
ʾ¿Ǻȱ仯ԶиӣijЩ¿ǺȾȻֻ 30ǧңһЩ 80ǧס
־IJγɺݻУ˼Ϊӵĵʻ漰ģǨƺڲͷţһֳ߸ǶʹĴͳ֪
Ĵɷо棬ȥѧձΪĴ㼫ϡԺԲƣҪɷǺ벵ȶ壬Ʋ 10֡
һšĴ̽豸ȴһЩ벻ijɷ֪֡Ķ⣬ˮԼһЩӵлȩ״ȡ
ȻЩʵĺ٣ǵĴȴΪݻоµķ
ҲЩлʷУͨСײ̫ʵöģһΪѰԴṩµ
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