A spasm is a sudden, involuntary contraction of a muscle, a group of muscles, or a hollow organ such as a heart, or a similarly sudden contraction of an orifice.It most commonly refers to a muscle cramp which is often accompanied by a sudden burst of pain, but is usually harmless and ceases after a few minutes. spasm is a sudden, involuntary contraction of a muscle, a group of muscles, or a hollow organ such as a heart, or a similarly sudden contraction of an orifice.
Top 10 largest Cement Producing Countries in the World. China has the first stage in the list of cement producing countries. They produce more than 2482 million tonnes. It is mainly used for construction and china is highly populated.
In the 1960s, CEMEX grew significantly when it acquired several more plants throughout Mexico. In 1976, the company went public on the Mexican stock exchange, and that same year, became the largest cement producer in Mexico with the purchase of three plants from Cementos Guadalajara. In 1982, the company made significant progress in overseas markets, doubling its exports.