֪ļη   
񲡿ɷΪƲ没Ӫࡣ
߼ͥƽʱҪ׼һЩҩԹβãЩҩβõģֻ͡Է۵רΪβ׼ġ
1ɱҩ70%Ũȵľƾ2%-4%ŨȵնúҺɽʭ0.1%-0.5%ĸҺԽϻɱӻʯɵ20%Էۿʭȼ棻ơҩˮࡢΪûڷҩ
2ҩƷסۼȡùءùءĻءùڷҩ
3Ƹðۼۡѽᡢڼҩȡ糤Чǰɰ׷ֲۡͣͣ澻ȡ
⣬׼һЩάҩӦάȱ֢֮衣
ļ
1.ĸ˺
˺Σ񣬼Բɼήۣëɣ䣬ʳӣ̻ɫˮࣻԲΪſڴһ𣬾񣬳ȡˮסؽ볦׵Ȳ
ƣڷ߻ࡢǰͿصȶԱнϺõЧ
Ԥϰѡӿ롱أˮҪʡɾ
2.񵤶
ƤճĤĴ˶ͻȻСʱ10СʱʱԻΪʳ˯ϲһ磬ƶѪݡ
ƣùЧѣùءùЧ֮߻ૺͻǰЧϲ
   