A.5° B.8° C.7° D.60
A.焊接時(shí)間長(zhǎng) B.焊接時(shí)間短 C.焊接時(shí)間較短 D.造成虛焊假焊、漏焊
A.(250±5)℃ B.(250±2)℃ C.(350±2)℃ D.(350±5)℃