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Originally the phrase was an abbreviation of, and synonymous to, popular music, but developed around 1954 to state a particular musical category. The stylistic origins of pop music is folk,jazz,R&B,rock and roll,traditional pop music.The typical instruments are classical guitar,bass guitar,drum kit and keyboard.The cultural origins date back to 1950's in the United States.It is popular worldwide since 1960s.
The personnel of the duty station authorized to set up the checkpoints shall show the highway inspection certificate issued by the general office of the provincial people's government and wear industry inspection marks when performing the inspection tasks. Without the above certificates and marks the illegal inspection.
Is a new type of ballastless track, with reinforced concrete slabs, and under the big board with emulsified asphalt cement mortar as the first adjustment layers (or overlay on a cushion of high molecular elastic material layer) consisting of orbit. This kind of track is suitable for stone roadbed or non - ballasted deck. The asphalt concrete bearing layer shall be installed on the soil foundation. This kind of track integrity is good, the line is stable, the maintenance workload is small, but the cost is high, the construction period is long. Japanese railways have been used in the Shinkansen
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