解:① Φ8=(2.7-0.015×2)×[(2.4-0.015×2)÷0.15 1]×0.395 =2.67×13×0.395 =13.71 kg
② Φ8=2.37×19×0.395=17.79 kg
③ Φ12=(0.5 0.1×2)×[(2.67 2.3)×2÷0.2 4 ]×0.888=33.56 kg
④ Φ6.5=(2.67 ×6 2.37 ×6) ×0.26=7.86 kg
小计: Φ10以内:(13.71 17.79 7.86)×10=393.60 kg
Φ10以上:33.56×10=335.60 kg