国产小视频91|中文字幕日产乱码六区小草|福利午夜精品|日日噜噜噜噜夜夜爽亚洲精品,国产人免费人成免费视频,在线欧美激情,国内精品伊人久久

Copper has good corrosion resistance and thermal conductivity, and copper heat exchange tubes have good heat transfer coefficients.

Zhengwei heat exchanger can customize heat exchangers of different materials, such as copper, aluminum, titanium, nickel, etc. according to customer requirements.