常見例句雙語例句The results show that:under the no preheating condition, the microstructure of weld metal is columnar austenitic, and brittle martensite exists in the fusion zone and over-heated zone unavoidably.研究結(jié)果表明：在不預熱條件下，用KD286焊補鋼軌，焊縫組織為柱狀奧氏體組織，熔合區(qū)和過熱區(qū)不可避免地產(chǎn)生脆硬的馬氏體組織。 返回 over-heated zone