Sound can be in the pipe string, can be in ancient books.
声可托于弦管，名可留于竹帛。
What is the drill pipe string weight in air?
钻杆在空气中的重量是多少？
In order to solve this problem, the pipe string for pumping thick-oil is designed.
为解决偏远井及偏远区块的稠油井井筒举升的问题，设计此稠油管柱。
In order to solve this problem, the pipe string for pumping thick-oil is designed.
为解决偏远井及偏远区块的稠油井井筒举升的问题，设计此稠油管柱。
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