In order to ensure the requirement of high anti-sulfur in Luojiazhai and Tieshan sour gas well, some casing heads and gas-producing wellheads have been imported since 2003.

为保证川东北地区罗家寨、铁山坡构造高含硫气井长期采气高抗硫要求，2003年起，从国外进口了部份套管头和采气井口。

youdao

Tieshan said his eight-member delegation, appointed by the Chinese government, includes representatives from Christianity, Buddhism, Taoism and Islam.

CNN: Tieshan