A.5m B.10m C.15m D.20m
A.20°~65° B.30°~75° C.40°~85° D.50°~95°
A.球罐組裝完畢后,應(yīng)按先縱縫后環(huán)縫的原則安排焊接順序 B.縱縫焊接時(shí),焊機(jī)布置應(yīng)對(duì)稱均勻,并同步焊接 C.縱縫焊接時(shí),焊機(jī)布置應(yīng)對(duì)稱均勻,不應(yīng)同步焊接 D.環(huán)縫焊接時(shí),焊機(jī)布置應(yīng)對(duì)稱,并沿同一旋轉(zhuǎn)方向焊接