题目内容

下列哪项不是焊料焊接中烧坏焊件的原因

A. 砂料包埋时对细小焊件及焊件的薄边缘保护不够
B. 焊料强度过低
C. 焊料熔点过高
D. 焊接火焰掌握不好，在某一局部加热过多，温度过高
E. 焊料全部熔化后，没有迅速撒开火焰

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