The bending test is the necessary inspection item of titanium plate and welding joint for the manufacture of titanium vessel.
冷弯试验是钛容器制造中对铁板和焊接接头的必保检验项目。
The content of formaldehyde is a compulsory examination item in textile inspection, so it is very necessary to understand related factors that affect the determination of formaldehyde content.
甲醛含量作为纺织产品检验工作中的一项强制性考核项目，了解和掌握影响其测定的相关因素是十分必要的。
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