Like the millipedes, centipedes are highly segmented (15 to 177 segments), but with only one pair of walking legs per segment (millipedes have two legs per segment). The head of a centipede has a pair of antennae, jaw-like mandibles (called forcipules) and other mouthparts.
Although compressed natural gas (CNG) is a fossil fuel like diesel, gas and coal, it is far different in terms of its impact on the natural environment.
For gas tungsten arc welding (GTAW), pure argon is more commonly used as a shielding gas. Helium/argon mixtures can be used for applications that require high heat transfer, but those applications arenât widespread. Pure helium or mixtures with a high percentage of helium sometimes are used with GTAW machines with direct current electrode negative.