The machine with high automation and speed is an ideal equipment for making PE plastic heatingcombination soft packing bag of zipping.
整机自动化程度高，制袋速度快，是制作PE上拉链带热烫塑料软包装袋的理想设备。
2
A combination of over four years of work experience in the trade and some college or industry courses in heating systems installation and repair is usually required for trade certification.
通常需要四年的行业内工作经验，和大学或供暖系统的安装和维修行业的课程组合，才有资格获得行业认证。
3
Welded sections will also have locked-in stress owing to a combination of differential heating and cooling cycles as well as to changes in cross section.