Carbonate rocks are predominantly composed of intra - clastic dolostone, chert dolostone and sand - bearing dolostone.碳酸盐岩以内碎屑白云岩 、 燧石白云儿和含砂白云岩为主.In clastic sediments, particle size is an important factor.在碎屑沉积物中, 颗粒大小是个...
Wood flooring not only cleans easily, but it's environmentally friendly into the bargain.木地板不光容易打扫，而且还环保。More and more companies have gone "green" and started producing so-called environmentally-friendly products.越来...