简答题 翻译：Practically every rig uses internal-combustion engines as its prime power source, or its prime mover.

问答题翻译：Also specified in gas purchase contracts is the maximum amount of sulfur the sales gas may contain.

问答题翻译In general, gas pipelines operate at higher pressure than crude lines; gas is moved through a gas pipeline by compressors rather than by pumps; and path of natural gas to the user is more direct.

问答题翻译：the pressure of a gas varies inversely as its volume, with temperature being constant.

问答题翻译：Also similar to the pseudo-reduced pressure, the pseudo-reduced temperature of natural gases varies with the specific gravity of the gas.

问答题翻译：Using this result fig. 1 is entered on the bottom line vertically to the intersection of the chart line and the conversion factors are read in the left hand column.