大部分补强板是从与所修管道具有相同直径的管子上切割下来。
Most patches were fabricated from material cut from pipe having approximately the same diameter as the pipe to be repaired.
大部分补强板是从与所修管道具有相同直径的管子上切割下来。
Most patches were fabricated from material cut from pipe having approximately the same diameter as the pipe to be repaired.
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