Ҫ
1.W(wng)վkW(wng)վȸpr>=4,ٶȸ
2.DMW(wng)վ_1И˜Խoһ(g)(y)վ(w)ֱ朽Ӵ(y) 3.ҷṩVλ100*50؈DƬVλλÞ(y)² 4.W(wng)վkڌW(wng)վ(y)վһ(g)100*50؈DƬVλDMڌDMϞҷһ(g)DƬVСС4*4cm.