Hard PVC是什么意思

用法例句

On the"safety first,prevention"construction principle,reasonably select blasting parameters,immediately insert PVC rigid plastic pipe after drilling hole,ensured the quality of charge,improved circulation footage,ensured the regular cycle of construction.

本着"安全第一,预防为主"的施工原则,合理地选取爆破参数,打眼后立即插入pvc硬质塑料管,保证了装药质量,提高了循环进尺,保证了工程施工的正规循环。