《燃煤二氧化硫排放污染防治技术政策》规定:城镇民用炊事炉灶、茶浴炉以及产热量在()的采暖炉应禁止燃用原煤,提倡使用电、燃气等清洁能源或固硫型煤等低污染燃料,并应同时配套高效炉具。
A. 1.4MW以下
B. 2.1MW以下
C. 0.7MW以下
D. 1.4蒸t/h以下
Petroleum is a very important mineral. It gives us heat and light. It also gives us power for our cars, planes, and ships. It gives us power for machines of all kinds.How was petroleum created Scientists believe petroleum was formed from the remains of plants and animals. These plants and animals lived and died millions of years ago. Remains are what is left after a plant or animal has died.What exactly is petroleum Petroleum is a mineral that is a mixture of hydrocarbons. It is an oily liquid which may be brown, green, or black in color. The word "petroleum" comes from Latin and Greek. It means "rock oil".Crude oil is petroleum that comes directly from deep in the ground. It is then taken to a refinery. A refinery is a kind of factory with equipment in it to refine oil. At a refinery the crude oil is purified and separated into its various parts. From the refined petroleum we obtain important products, such as gasoline, kerosene, fertilizers, detergents, plastics, drugs, and perfumes. These are just a few of the thousands of useful products we get from this valuable mineral - petroleum. The word "petroleum" comes from () and ().