How about septic tanks for toilets in rural areas

How about septic tanks for rural toilets? What materials are good for rural household septic tanks

����The guiding opin..

What is the difference between FRP and KFRP, the central stiffener of optical cable and leather cable?

The differences between FRP and KFRP are as follows

FRP, fiber reinforced composite plastic, is the abbreviation ..

What is the function of the two steel wires in the optical fiber

This is called reinforcing core, because the optical fiber is a thin glass fiber, which is fragile and has low strength. If the strength of this..