HCBBS Forum (English)
Submit Chemical Projects / Find Solutions
Amplify Your Requirements on a Broader Chemical Platform *Engineering · Technology · Equipment · Solutions*
Submit Request

One Question per Day ---------- Multiple-choice Questions on Basic Process Knowledge (October 28)

2017-10-28View Original

Thread Content

You receive a wealth reward just for participating. Multiple-choice question: To prevent changes in the concentration of flammable and explosive substances in welding equipment, pipelines, or the areas surrounding them, the time interval between sampling before welding and starting the welding process must not exceed ( ) minutes. A、15 B、20 C、30 D、40

Submit a Project

**Looking for Chemical Technology, Equipment & Solutions?** No Registration Required Broader Platform Exposure | Global Chemical Service Provider Connections

Submit Request — Free Consultation

Disclaimer

This is an automated machine translation of the original thread. Some technical terms may have inaccuracies; the original text shall prevail. Click "View Original" at the top right to access the source page, which supports IP-based automatic real-time language translation. Please watch out for contact details and sales inducements to prevent fraud. All content and translations are for reference only, representing solely the poster's personal views. For enquiries, email service@hcbbs.com.