The D1200 prestressed concrete pipe pile is a state key task scientific research fruit of the "Sixth Five-year Plan" period.
D1200预应力砼大管桩是国家“六五”科技重点攻关成果。
The D1200 prestressed concrete pipe pile is a state key task scientific research fruit of the "Sixth Five-year Plan" period.
D1200预应力砼大管桩是国家“六五”科技重点攻关成果。
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