竞彩足球让球胜平负混合过关|捷报即时比分手机网|球探即时比分足球比分捷报球|竞猜中国,今日竞彩足球开奖查询,斯诺克即时比分查询,捷报即时比分网

The spiral tube heat exchanger is made of one or more sets of spirally wound tubes placed in the shell. It is characterized by compact structure, larger heat transfer area than straight pipes, and smaller temperature difference stress, but it is difficult to clean inside the pipe and can be used for heating or cooling fluids with higher viscosity.