借助光学和扫描电子显微镜，从材料成分、微观组织和性能角度，分析了U 形管换热器开裂原因。
The cracking causes of a U shaped tube heat exchanger were analysed in material compositions, microstructure, properties with the help of optional microscope and SEM.
管形锁：制栓，建筑材料有黄铜或青铜，不锈钢，镍银。
A. Lock Cylinders: Tumbler type, constructed from brass or bronze, stainless steel, or nickel silver.
H112铝合金口琴形扁管是制造全铝管-带式汽车空调器的又-新型铝合金材料。
D97-H112 aluminium alloy harmonica-shape flat tube is a new type aluminium alloy material used for making the automotive air-conditioners in the tube-band type.
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