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The PQR shall include the composition and flow rate of the shielding and inert gas backing, when used.

焊接工艺评定记录单上应包括封底焊时所用的惰性保护气体组成成分和流率。

youdao

They cause all the welding of double tubes, joint boxes and gas-collecting tubes to realize the backing weld of TAW-P. The quality of the double tube waste heat boilers have been improved.

并对喷嘴、规范参数、坡口形式等作了相应改进，使双套管、联箱、集气管的焊接全部实现了钨极氩弧焊打底，从而提高了双套管废热锅炉的质量。

youdao

Mr.Obama and Democrats in Congress are backing a "cap and trade" bill, which aims to cut greenhouse gas emissions 17 percent by 2020.

VOA: standard.2009.05.30

And recently Turkey has sounded keener, with American backing, for gas as well as oil pipelines to run from the Caspian across Georgia and into Turkey, to by-pass the prickly Russians.

ECONOMIST: Ismail Cem, a Turkish strategist

The U.S. is also backing a parallel natural gas pipeline through Azerbaijan.

NPR: Azerbaijan President Visits Washington

As I recently reported, AOL seems to be easing up on the gas somewhat with Patch, backing away from earlier promises that the network will include more than 1, 000 towns by the end of 2011.

FORBES: UBS Analysts on AOL: 'Turnaround Is Gaining Traction'