【单选题】
堆焊金属的相变温度和膨胀系数比基体金属___
A. 高
B. 相近
C. 低
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答案
B
解析
暂无解析
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___由逆止阀与火焰消除器组成,前者阻止可燃气的回流，以免在气管内形成爆炸性混合气,后者能防止火焰流过逆止阀时，引爆气管中的可燃气。
A. 防爆阀
B. 装回火防止器
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