A.1 B.2 C.3 D.5
A.1/1000一3/1000 B.2/1000一1/1000 C.1/1000一2/1000 D.2/1000一3/1000
A.鋼桿件不應(yīng)大于350,木桿件不應(yīng)大于250 B.鋼桿件不應(yīng)大于360,木桿件不應(yīng)大于280 C.鋼桿件不應(yīng)大于370,木桿件不應(yīng)大于260 D.鋼桿件不應(yīng)大于380,木桿件不應(yīng)大于270