In the elastic body of polyurethane, is the NCO/OH = 1.05 1.05? How does the NCO and OH inside calculate? The key is how to calculate it. It is best to give an example. I haven't understood this problem for a long time. Please help me to answer in detail. Thank you
Where is Zhengzhou's largest used car trading market? I want to buy a second -hand car about 50,000 ... Please tell me where is the address? The as if the place on the first floor has been relocated?
I think my accounting knowledge is not very proficient, so I want to join some accounting QQ groups. I hope to get the guidance of the elders, so please help provide some useful QQ groups, thank you!
