A certain sample of straight-run gasoline (light naphtha) might contain nearly 30 aliphatic (containing no benzene ring), noncyclic hydrocarbons; nearly 20 cycloaliphatic hydrocarbons (mainly cyclopentanes and cyclohexanes), sometimes called Table 1. FRACTIONS OF PETROLEUM Approximate bp (°C) ...
grows below ground and the shoot system which grows above it.The typical root system fixes the plant firmly in the soil,and absorbs water and various dissolved raw materials from it.The typical shoot system consists of a main stem upon which are borne leaves,branch shoots,and sometimes flowers...
wells are drilled into the ground. Permanent towers, called derricks, used to be built to handle the long sections of drilling pipe. Now portable drilling machines are set up and are then dismantled and removed
Sometimes crude oil is secured by drilling a hole through the earth, but more dry holes are drilled than those producing oil. Pressure at the source or pumping forces crude oil to the surface. Crude oil wells flow at varying rates, from ten to thousands of barrels per hour. Petroleum ...
In fact, the word“ petroleum” literally means“rock oil.” And, in its original state, the way we find it in Earth’s crust, it's called“ crude oil.” Sometimes people shorten that up and, ah, just refer to it as“ crude.” Um, petroleum also contains natural gas, so usually...
Sometimes crude oil is secured by drilling a hole through the earth, but more dry holes aredrilled than those producing oil. Pressure at the source or pumping forces crude oil to the surface.Crude oil wells flow at varying rates, from ten to thousands of barrels per hour. Petroleum products...
正确选项对应文中的Petroleum, consisting of crude oil and natural gas, seems to originate from organic matter in marine sediment.
Sometimes, the ground at an oil field may subside as oil is removed. The Wilmington field near Long Beach, California, has subsided nine meters in 50 years; protective barriers have had to be built to prevent seawater from flooding the area. Finally, the refining and burning of petroleum ...
Sometimes crude oil is secured by drilling a hole through the earth, but more dry holes are drilled than those generating oil. Pressure at the source or pumping forces crude oil to the surface.Crude oil wells flow at varying rates, from ten to thousands of barrels per. hour. Petroleum ...
Sometimes, the ground at an oil fieldmay subside as oil is removed. The Wilmington field near Long Beach, California, has subsided nine meters in 50 years; protective barriers 17、have had to be built to prevent seawater from flooding the area. Finally, the refining and burning of ...