增加焊缝中的共晶数量并改善其分布形态，从而有助于降低焊缝金属的热裂纹敏感性。
The improvement of microstructure leads to a considerable reduction of the susceptibility of hot cracking of weld metal as indicated by the transverse-varestraint test.
本文在随机截尾模型的基础上，为了提高回答者的合作程度，提出了两种改进的调查敏感性问题数量特征的随机化回答方法。
Method Cochran's classic sampling theo- ries, the improved randomized response technique(RRT) model, total probability formulas and properties of variance were used in this paper.
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