The results of industrial tests show that secondary oxidation of liquid steel at the initial stage of casting process is a major factor for the increasing oxygen content of steel.
工业试验结果表明，在连铸生产过程中，开浇阶段钢水的二次氧化是钢中氧含量增加的主要原因。
The major influencing factor that uses the orthogonality testing law analysis concrete filled steel tube is for the concrete filled steel tube the influence of mechanics performance;
利用正交试验法分析钢管混凝土的主要影响因素对钢管混凝土的力学性能的影响；
Global stability of the major steel structure is considered to be a key controlling factor on structural safety.
主体钢结构的整体稳定性设计是结构安全的控制因素。
Although the cause has some relation with construction operation, yet the major factor should be due to deficiency of the theory and improper design of the prestressed steel.
尽管存在施工方面的原因，但结构设计理论不足，是预应力混凝土箱梁开裂的主要原因。
Although the cause has some relation with construction operation, yet the major factor should be due to deficiency of the theory and improper design of the prestressed steel.
尽管存在施工方面的原因，但结构设计理论不足，是预应力混凝土箱梁开裂的主要原因。
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